feat(base-telemetry-javac): extract MessagerBasedTelemetryRecorder

[deer]

java.compiler is a tooling module with no place in a production runtime image. Any library depending on base-telemetry-foundation previously inherited it transitively, which unnecessarily inflated jlink images. The extraction follows the same boundary principle as base-telemetry-ansi: one module per recorder backend, named for its dependency.

• Introduces a new base-telemetry-javac module containing MessagerBasedTelemetryRecorder, previously in base-telemetry-foundation
• Removes requires java.compiler from base-telemetry-foundation, so consumers of the telemetry foundation no longer transitively pull in the compiler tooling module
• The new module lives at build.base.telemetry.javac and explicitly declares requires java.compiler, keeping that dependency scoped to annotation processor consumers only