PANA-8613: View traversal and decomposition

[jonathanmos]

What does this PR do?

This is the third pr of the new pipeline.

Adds view traversal and decomposition for the new composition-based Session Replay capture pipeline: AndroidWindowTraversal recursively walks a window's native View hierarchy into CapturedLayer/CapturedWireframe trees (combining what were separately TreeViewTraversal and SnapshotProducer in the legacy pipeline), AndroidCapturedSnapshotProducer assembles all active windows into one CapturedFullSnapshot, and a new composition/mapper package provides Text/WebView/Hidden/generic-fallback view mappers plus a background-shape-style resolver, wired into DefaultRecorderProvider.

Motivation

PANA-8613 — next step in the composition-pipeline workstream (following PANA-8612's capture orchestration): the orchestrator needs a real CapturedSnapshotProducer that can actually decompose the live View hierarchy instead of a stub.

Additional Notes

• Ancestor-clip bounds are threaded through recursion via a mutable stack (push/pop) rather than list concatenation, to avoid O(depth) allocation per view.
• Masking/privacy is explicitly out of scope for this workstream; text and images are captured unmasked for now.
• ComposeView hosts are detected by class name only (no compile-time androidx.compose dependency) and handed off to an optional composeHostCallback rather than traversed as native children.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 72.82% (+0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 5ce8684 | Docs | View more details | Give us feedback!}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.62040% with 79 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.39%. Comparing base (50400d0) to head (5ce8684).

Files with missing lines	Patch %	Lines
...ernal/composition/mapper/CapturedTextViewMapper.kt	40.96%	44 Missing and 5 partials ⚠️
...lay/internal/composition/AndroidWindowTraversal.kt	88.79%	2 Missing and 10 partials ⚠️
...nal/composition/AndroidCapturedSnapshotProducer.kt	83.33%	3 Missing and 4 partials ⚠️
...eplay/internal/composition/RumViewScopeProvider.kt	50.00%	5 Missing ⚠️
.../sessionreplay/internal/DefaultRecorderProvider.kt	92.86%	2 Missing and 1 partial ⚠️
...l/composition/mapper/CapturedViewMapperRegistry.kt	87.50%	1 Missing and 1 partial ⚠️
...ion/mapper/CapturedBackgroundShapeStyleResolver.kt	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                        Coverage Diff                        @@
##           jmoskovich/02-sr-new-pipeline    #3728      +/-   ##
=================================================================
+ Coverage                          73.35%   73.39%   +0.05%     
=================================================================
  Files                               1021     1032      +11     
  Lines                              37902    38221     +319     
  Branches                            6599     6659      +60     
=================================================================
+ Hits                               27800    28052     +252     
- Misses                              8183     8227      +44     
- Partials                            1919     1942      +23     

Files with missing lines	Coverage Δ
...sessionreplay/internal/composition/CapturedTree.kt	100.00% <100.00%> (+9.76%)	⬆️
...nal/composition/mapper/CapturedHiddenViewMapper.kt	100.00% <100.00%> (ø)
...al/composition/mapper/CapturedMapperTypeWrapper.kt	100.00% <100.00%> (ø)
...position/mapper/CapturedViewGroupFallbackMapper.kt	100.00% <100.00%> (ø)
.../internal/composition/mapper/CapturedViewMapper.kt	100.00% <100.00%> (ø)
...ternal/composition/mapper/CapturedWebViewMapper.kt	100.00% <100.00%> (ø)
...ion/mapper/CapturedBackgroundShapeStyleResolver.kt	85.71% <85.71%> (ø)
...l/composition/mapper/CapturedViewMapperRegistry.kt	87.50% <87.50%> (ø)
.../sessionreplay/internal/DefaultRecorderProvider.kt	92.59% <92.86%> (+0.59%)	⬆️
...eplay/internal/composition/RumViewScopeProvider.kt	50.00% <50.00%> (ø)
... and 3 more

... and 37 files with indirect coverage changes

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