Make a copy of attributes before passing them to RUM event

[0xnm]

What does this PR do?

This PR makes a copy of the attributes used by the different RUM events, because usually these attributes are stored in as the shared property of the RUM scope, they could be modified by the RUM thread while being read during the serialization on the I/O thread.

This will eventually prevent ConcurrentModificationException.

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)

[mariusc83]

Nice catch

[codecov-commenter]

Codecov Report

Merging #1830 (2238f81) into develop (3d5e3d6) will increase coverage by 0.09%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1830      +/-   ##
===========================================
+ Coverage    83.45%   83.54%   +0.09%     
===========================================
  Files          467      467              
  Lines        16484    16486       +2     
  Branches      2482     2483       +1     
===========================================
+ Hits         13756    13772      +16     
+ Misses        2040     2039       -1     
+ Partials       688      675      -13     

Files	Coverage Δ
...ndroid/rum/internal/domain/scope/RumActionScope.kt	97.19% <100.00%> (+0.58%)	⬆️
...roid/rum/internal/domain/scope/RumResourceScope.kt	94.10% <100.00%> (-0.70%)	⬇️
.../android/rum/internal/domain/scope/RumViewScope.kt	93.94% <100.00%> (+0.78%)	⬆️

... and 19 files with indirect coverage changes