LAL: generalize extraLog type, add EnvoyAccessLogBuilder, and DSL class generator test

[wu-sheng]

Follow-up improvements to LAL v2 outputType mechanism (#13733)

These changes fix several issues discovered after the initial outputType PR and add a DSL class generator test for offline validation.

Key changes:

1. Generalize extraLog from Message to Object — ILogAnalyzerService.doAnalysis() and the entire listener chain now use Optional<Object> instead of com.google.protobuf.Message. This removes the protobuf coupling and allows non-protobuf input types in the future.

2. LALOutputBuilder.init() accepts Object instead of LogData — Each builder casts to its expected input type internally (e.g., LogData for standard logs, HTTPAccessLogEntry for envoy). This enables the envoy access log builder to receive the raw protobuf entry directly.

3. Add EnvoyAccessLogBuilder — A new LALOutputBuilder implementation for envoy access logs that extends LogBuilder and serializes the raw access log entry as JSON content. Registered via SPI and declared as the default output type for the MESH layer in EnvoyHTTPLALSourceTypeProvider.

4. Move addTag off LALOutputBuilder interface — addTag() was a default no-op on the interface, silently dropping tags for non-Log output types. Now it only exists on LogBuilder, and the LAL compiler validates at compile time that tag assignments are only used with LogBuilder-compatible output types.

5. Remove dead LogSinkListenerFactory methods — addSinkListenerFactory() and getSinkListenerFactory() on ILogAnalysisListenerManager were unused after the v2 refactoring.

6. Remove unused ModuleManager/ModuleConfig from LogAnalyzer — Constructor now only takes ILogAnalysisListenerManager.

7. Add DSLClassGeneratorTest — A test in server-starter that compiles all OAL, MAL, LAL, and Hierarchy scripts and dumps .class files to target/generated-dsl-classes/ for offline inspection. Documents the tool in the debugging guide.

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.