LAL: generalize extraLog type, add EnvoyAccessLogBuilder, and DSL class generator test (#13736)

### 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.