RUM-4719 Improve ButtonMapper

[xgouchet]

What does this PR do?

Improve the ButtonMapper by letting it extend TextViewMapper, and add more exhaustive and cleaner tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.84%. Comparing base (8e9ada1) to head (fbfa373).
Report is 12 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2070      +/-   ##
===========================================
- Coverage    83.22%   82.84%   -0.38%     
===========================================
  Files          494      494              
  Lines        17731    17726       -5     
  Branches      2682     2681       -1     
===========================================
- Hits         14755    14684      -71     
- Misses        2247     2310      +63     
- Partials       729      732       +3     

Files	Coverage Δ
.../sessionreplay/internal/DefaultRecorderProvider.kt	92.59% <100.00%> (+0.28%)	⬆️
...ionreplay/internal/recorder/mapper/ButtonMapper.kt	72.73% <100.00%> (-14.77%)	⬇️

... and 31 files with indirect coverage changes