RUM-6218: Add privacy override for hidden views

[jonathanmos]

What does this PR do?

Sets up the common mechanism for privacy overrides and implements overriding view privacy to hidden in the hierarchy.

Views will be able to set hidden override privacy using the api:
[view].setSessionReplayHidden(hide = true/false)
where true will register the view to be replaced with a placeholder with the label "Hidden", and false will remove the hidden override from the view. The children of hidden views will not be traversed.

Motivation

This is part of the third stage of Fine Grained Masking. The first stage was the start/stop api, and the second was global fine grained masking levels for the app.

Additional Notes

Anything else we should know when reviewing?

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)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.33%. Comparing base (4cc5caf) to head (f16a5d4).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ssionreplay/internal/recorder/TreeViewTraversal.kt	42.86%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2291      +/-   ##
===========================================
+ Coverage    70.31%   70.33%   +0.02%     
===========================================
  Files          736      738       +2     
  Lines        27456    27493      +37     
  Branches      4606     4610       +4     
===========================================
+ Hits         19305    19337      +32     
- Misses        6862     6873      +11     
+ Partials      1289     1283       -6     

Files with missing lines	Coverage Δ
...android/sessionreplay/PrivacyOverrideExtensions.kt	100.00% <100.00%> (ø)
...nreplay/internal/recorder/SessionReplayRecorder.kt	96.99% <100.00%> (+0.07%)	⬆️
...eplay/internal/recorder/mapper/HiddenViewMapper.kt	100.00% <100.00%> (ø)
...ssionreplay/internal/recorder/TreeViewTraversal.kt	89.47% <42.86%> (-6.60%)	⬇️

... and 32 files with indirect coverage changes

[ambushwork]

LGTM, well done!