feat: implement custom-response plugin in the golang version

[cr7258]

Ⅰ. Describe what this PR did

Implement custom-response plugin in the golang version.

Ⅱ. Does this pull request fix one issue?

fixes #592

Ⅲ. E2E test

--- PASS: TestHigressConformanceTests (70.12s)
    --- PASS: TestHigressConformanceTests/WasmPluginsCustomResponse (1.19s)
        --- PASS: TestHigressConformanceTests/WasmPluginsCustomResponse/WasmPlugins_custom-response (1.12s)

[CLAassistant]

All committers have signed the CLA.

[johnlanni]

cc @WeixinX

[WeixinX]

逻辑不符合预期，请再仔细对照并参考 CPP 的实现~

[WeixinX]

当插件用于 Mock 响应（enableOnStatus 为空）时，可以在 onHttpRequestHeaders 里使用 proxywasm.SendHttpResponse 自定义响应；若用于修改响应（enableOnStatus 非空）时，在 onHttpRequestHeaders 里返回 types.ActionContinue 即可。参考 CPP:

FilterHeadersStatus PluginRootContext::onRequest(
    const CustomResponseConfigRule& rule) {
  if (!rule.enable_on_status.empty()) {
    return FilterHeadersStatus::Continue;
  }
  sendLocalResponse(rule.status_code, "", rule.body, rule.headers);
  return FilterHeadersStatus::StopIteration;
}

[WeixinX]

而对于修改响应（enableOnStatus 非空）这种用例，需要在 onHttpResponseHeaders 进行处理，即通过 proxywasm.GetHttpResponseHeader(":status") 获取状态码与 enableOnStatus 列表中的状态码匹配，若命中，则返回自定义响应信息，否则直接返回 types.ActionContinue。参考 CPP:

FilterHeadersStatus PluginRootContext::onResponse(
    const CustomResponseConfigRule& rule) {
  GET_RESPONSE_HEADER_VIEW(":status", status_code);
  bool hit = false;
  for (const auto& status : rule.enable_on_status) {
    if (status_code == status) {
      hit = true;
      break;
    }
  }
  if (!hit) {
    return FilterHeadersStatus::Continue;
  }
  replaceResponseHeader(Wasm::Common::Http::Header::ContentType,
                        rule.content_type);
  sendLocalResponse(rule.status_code, "", rule.body, rule.headers);
  return FilterHeadersStatus::StopIteration;
}

[cr7258]

@WeixinX 已根据建议完成了所有的修改，请重新review，谢谢。
另外我看到 Build and Test Plugins / higress-wasmplugin-test (GO) (pull_request) 测试失败了，但是我在本地跑的时候是成功的。

PLUGIN_TYPE=GO make higress-wasmplugin-test
......
--- PASS: TestHigressConformanceTests (50.32s)
    --- SKIP: TestHigressConformanceTests/CPPWasmPluginsBasicAuth (0.00s)
    --- SKIP: TestHigressConformanceTests/CPPWasmPluginsKeyAuth (0.00s)
    --- SKIP: TestHigressConformanceTests/CPPWasmPluginsRequestBlock (0.00s)
    --- PASS: TestHigressConformanceTests/WasmPluginsBasicAuth (1.08s)
        --- PASS: TestHigressConformanceTests/WasmPluginsBasicAuth/WasmPlugins_basic-auth (1.05s)
    --- PASS: TestHigressConformanceTests/WasmPluginsCustomResponse (1.06s)
        --- PASS: TestHigressConformanceTests/WasmPluginsCustomResponse/WasmPlugins_custom-response (1.04s)
    --- PASS: TestHigressConformanceTests/WasmPluginsJwtAuth (1.03s)
        --- PASS: TestHigressConformanceTests/WasmPluginsJwtAuth/WasmPlugins_jwt-auth (1.01s)
    --- PASS: TestHigressConformanceTests/WasmPluginsRequestBlock (1.04s)
        --- PASS: TestHigressConformanceTests/WasmPluginsRequestBlock/WasmPlugins_request-block (1.03s)
    --- PASS: TestHigressConformanceTests/WasmPluginTransformer (1.06s)
        --- PASS: TestHigressConformanceTests/WasmPluginTransformer/WasmPlugin_transformer (1.03s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteAppRoot (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteCanaryHeaderWithCustomizedHeader (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteCanaryHeader (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteCanaryWeight (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteConsulHttpBin (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteDefaultBackend (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteDownstreamEncryption (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteEnableCors (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteEnableIgnoreCase (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteEurekaRegistry (0.00s)
    --- SKIP: TestHigressConformanceTests/HttpForceRedirectHttps (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteFullPathRegex (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteHostNameSameNamespace (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteHttp2Rpc (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteMatchHeaders (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteMatchMethods (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteMatchPath (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteMatchQueryParams (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRoutePermanentRedirectCode (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRoutePermanentRedirect (0.00s)
    --- SKIP: TestHigressConformanceTests/HttpRedirectAsHttps (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteRequestHeaderControl (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteRewriteHost (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteRewritePath (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteSameHostAndPath (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteSimpleSameNamespace (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteTemporalRedirect (0.00s)
    --- SKIP: TestHigressConformanceTests/HTTPRouteWhitelistSourceRange (0.00s)
PASS
ok  	command-line-arguments	50.937s

[WeixinX]

测试失败是因为 tinygo 编译报错

[johnlanni]

编译问题还没来得及看，应该是镜像的系统兼容问题导致的

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (612c94d) 38.17% compared to head (9598425) 38.13%.
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #689      +/-   ##
==========================================
- Coverage   38.17%   38.13%   -0.04%     
==========================================
  Files          61       61              
  Lines       10412    10428      +16     
==========================================
+ Hits         3975     3977       +2     
- Misses       6138     6152      +14     
  Partials      299      299              

see 3 files with indirect coverage changes

[cr7258]

@WeixinX Hello, 问一下这个PR目前还有什么需要修改的地方吗？

[WeixinX]

LGTM

[johnlanni]

LGTM