feat: make get_log_level available to plugin, respect log level

[nilslice]

The JS SDK variant of the changes here:

• Rust SDK: feat(runtime): add log level set/get for pdk control extism#758
• Go SDK: feat!: provide plugins get_log_level runtime function & support levels go-sdk#74

This is working in Deno, but not Node.. expected output is:

deno run -A examples/deno.ts ../go-sdk/wasm/log.wasm
calling {
  filename: "../go-sdk/wasm/log.wasm",
  funcname: "run_test",
  input: "this is a test"
}
Trace: this is a trace log
    at log_trace (file:///Users/steve/Projects/extism/js-sdk/src/call-context.ts:500:20)
    at github.com/extism/go-pdk.Log (wasm://wasm/000d0dde:1:14662)
    at run_test (wasm://wasm/000d0dde:1:15060)
    at ForegroundPlugin.callBlock (file:///Users/steve/Projects/extism/js-sdk/src/foreground-plugin.ts:76:7)
    at ForegroundPlugin.call (file:///Users/steve/Projects/extism/js-sdk/src/foreground-plugin.ts:96:46)
    at file:///Users/steve/Projects/extism/js-sdk/examples/deno.ts:19:26
    at eventLoopTick (ext:core/01_core.js:168:7)
this is a debug log
this is an info log
this is a warning log
this is an error log

[nilslice]

I think @chrisdickinson has and open PR targeting this branch. Let's merge that if CI is ready, and then this can be reviewed.

[nilslice]

@chrisdickinson - I am not confident about the conflicts here... if you get a moment to take a look, it would be much appreciated!

[chrisdickinson]

I'll take over the PR for a bit and take a look!