refactor: support chaining calls for flux and mono in javascript inline tag

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.0

What this PR does / why we need it:

支持在 JavaScript 中对 Flux 或 Mono 的泛型类型属性链式调用
测试参考：

halo/src/test/java/run/halo/app/theme/ReactiveFinderExpressionParserTests.java

Lines 131 to 147 in 7e9bdec

	return new StringTemplateResource("""
	<p th:text="${genericMap.key}"></p>
	<p th:text="${target.users[1].name}"></p>
	<p th:text="${target.objectJsonNodeFlux[0].name}"></p>
	<p th:text="${target.arrayNodeMono.get(0).foo}"></p>
	<script th:inline="javascript">
	var genericValue = /*[[${genericMap.key}]]*/;
	var name = /*[[${target.getName()}]]*/;
	var names = /*[[${target.names()}]]*/;
	var users = /*[[${target.users()}]]*/;
	var userListItem = /*[[${target.users[0].name}]]*/;
	var objectJsonNodeFlux = /*[[${target.objectJsonNodeFlux()}]]*/;
	var objectJsonNodeFluxChain = /*[[${target.objectJsonNodeFlux[0].name}]]*/;
	var mapMono = /*[[${target.mapMono.foo}]]*/;
	var arrayNodeMono = /*[[${target.arrayNodeMono.get(0).foo}]]*/;
	</script>
	""");

期望

halo/src/test/java/run/halo/app/theme/ReactiveFinderExpressionParserTests.java

Lines 64 to 79 in 7e9bdec

	assertThat(result).isEqualTo("""
	<p>value</p>
	<p>ruibaby</p>
	<p>guqing</p>
	<p>bar</p>
	<script>
	var genericValue = "value";
	var name = "guqing";
	var names = ["guqing","johnniang","ruibaby"];
	var users = [{"name":"guqing"},{"name":"ruibaby"},{"name":"johnniang"}];
	var userListItem = "guqing";
	var objectJsonNodeFlux = [{"name":"guqing"}];
	var objectJsonNodeFluxChain = "guqing";
	var mapMono = "bar";
	var arrayNodeMono = "bar";
	</script>

Special notes for your reviewer:

/cc @halo-dev/sig-halo

Does this PR introduce a user-facing change?

支持在 JavaScript 中对 Flux 或 Mono 的泛型类型属性链式调用

[f2c-ci-robot]

@guqing: The label(s) kind/improvment cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind improvment
/area core
/milestone 2.0

What this PR does / why we need it:

支持在 JavaScript 中对 Flux 或 Mono 的泛型类型属性链式调用
测试参考：
https://github.com/guqing/halo/blob/7e9bdec4923348b98df17b7e1071154ecec8ead1/src/test/java/run/halo/app/theme/ReactiveFinderExpressionParserTests.java#L131
https://github.com/guqing/halo/blob/7e9bdec4923348b98df17b7e1071154ecec8ead1/src/test/java/run/halo/app/theme/ReactiveFinderExpressionParserTests.java#L64

Special notes for your reviewer:

/cc @halo-dev/sig-halo

Does this PR introduce a user-facing change?

支持在 JavaScript 中对 Flux 或 Mono 的泛型类型属性链式调用

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[guqing]

/kind improvement

[JohnNiang]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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[ruibaby]

/lgtm