feat(tombstones): Add option to attach raw tombstone as protobuf (#5446)

* feat(android): Add option to attach raw tombstone as protobuf

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* changelog

* changelog

* ref(android): Rename attachTombstone to attachRawTombstone

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* test(android): Add tests for raw tombstone attachment

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Format code

* fix(android): Close tombstone InputStream after reading bytes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* ref(android): Extract shared readBytes into NativeEventUtils

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(android): Fix JavaDoc and address review feedback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* ref(android): Only pre-buffer tombstone bytes when attach option is on

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Sentry Github Bot <bot+github-bot@sentry.io>