[Feature][DevTool][Animation] Expose animation inspection metadata - #8837
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- Add stable animation identifiers, origins, and current-time metadata for DevTool inspection. - Track CSS and imperative animation lifecycle metadata without changing animation rendering timestamps. - Lazily allocate imperative animation metadata only for elements that use imperative animation APIs. - Use an FML monotonic anchor so platform VSync timestamp epochs do not affect inspector pause and resume timing. TEST: animation_unittests_exec (134 passed); dom_unittest_exec (3124 passed, 36 skipped)
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