Make Image Privacy a public api

[jonathanmos]

What does this PR do?

• Expose Image Privacy as a public api on the feature branch as part of fine grained masking (in develop it's still an internal api).
• Also change the default masking level to MASK_ALL as per the RFC.

Motivation

What inspired you to submit this pull request?

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

All modified and coverable lines are covered by tests ✅

Project coverage is 69.97%. Comparing base (d10126e) to head (2266b72).
Report is 2 commits behind head on feature/fine-grained-masking.

Additional details and impacted files

@@                       Coverage Diff                        @@
##           feature/fine-grained-masking    #2204      +/-   ##
================================================================
- Coverage                         69.99%   69.97%   -0.02%     
================================================================
  Files                               726      726              
  Lines                             27050    27046       -4     
  Branches                           4543     4542       -1     
================================================================
- Hits                              18931    18924       -7     
  Misses                             6837     6837              
- Partials                           1282     1285       +3     

Files	Coverage Δ
...ndroid/sessionreplay/SessionReplayConfiguration.kt	100.00% <100.00%> (ø)

... and 27 files with indirect coverage changes