RUM-2879: Disable non-fatal ANR reporting by default

[0xnm]

What does this PR do?

This PR disables non-fatal ANR reporting (the one which is using watchdog approach) by default for API 30+, but keeps it enabled on Android API 29 and below (because there is no fatal ANR reporting there).

Customer now has an opportunity to explicitly enable/disable it.

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

Merging #1914 (5d54877) into develop (5ffa623) will decrease coverage by 0.04%.
Report is 10 commits behind head on develop.
The diff coverage is 80.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1914      +/-   ##
===========================================
- Coverage    83.43%   83.39%   -0.04%     
===========================================
  Files          478      478              
  Lines        17124    17142      +18     
  Branches      2558     2565       +7     
===========================================
+ Hits         14286    14295       +9     
- Misses        2135     2140       +5     
- Partials       703      707       +4     

Files	Coverage Δ
...kotlin/com/datadog/android/rum/RumConfiguration.kt	96.83% <100.00%> (+0.10%)	⬆️
...lin/com/datadog/android/rum/internal/RumFeature.kt	92.38% <76.92%> (-1.16%)	⬇️

... and 21 files with indirect coverage changes