PANA-5681: Add heatmaps feature flag

[jonathanmos]

What does this PR do?

Adds a flag to enable the heatmaps feature (disabled by default) - setHeatmapsEnabled

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 72.19%. Comparing base (eeca598) to head (6a162ab).

Additional details and impacted files

@@                               Coverage Diff                               @@
##           gonzalezreal/PANA-5681/session-replay-heatmaps    #3500   +/-   ##
===============================================================================
  Coverage                                           72.19%   72.19%           
===============================================================================
  Files                                                 970      970           
  Lines                                               35666    35668    +2     
  Branches                                             5938     5937    -1     
===============================================================================
+ Hits                                                25747    25749    +2     
  Misses                                               8303     8303           
  Partials                                             1616     1616           

Files with missing lines	Coverage Δ
...com/datadog/android/sessionreplay/SessionReplay.kt	73.33% <100.00%> (+0.61%)	⬆️
...ndroid/sessionreplay/SessionReplayConfiguration.kt	96.74% <100.00%> (-0.04%)	⬇️
.../sessionreplay/internal/DefaultRecorderProvider.kt	94.41% <100.00%> (+0.04%)	⬆️
...oid/sessionreplay/internal/SessionReplayFeature.kt	98.28% <100.00%> (+0.01%)	⬆️

... and 41 files with indirect coverage changes

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