RUMM-2602: Use event write context in RUM

[0xnm]

What does this PR do?

This change brings the usage of event write context (EWC) to RUM (and to Web View RUM) and is similar to the move done in #1106, #1103.

Basically to write RUM events we now first request EWC via FeatureScope#withWriteContext call. This call is done at the very last point, so that the switch to the worker thread (where the closure is executed) doesn't affect the sequential flow and no changes to the shared state is done from the closure context.

There are some things which still keep RUM bound to the crash reporting or to the core feature (like the need to get server time offset outside of EWC, etc.), they will be addressed in the other PRs.

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]

LGTM

[codecov-commenter]

Codecov Report

Merging #1117 (d71fe7b) into feature/sdkv2 (4317825) will increase coverage by 0.17%.
The diff coverage is 95.09%.

@@                Coverage Diff                @@
##           feature/sdkv2    #1117      +/-   ##
=================================================
+ Coverage          82.32%   82.49%   +0.17%     
=================================================
  Files                352      348       -4     
  Lines              11426    11409      -17     
  Branches            1898     1910      +12     
=================================================
+ Hits                9406     9411       +5     
+ Misses              1442     1421      -21     
+ Partials             578      577       -1     

Impacted Files	Coverage Δ
.../android/error/internal/DatadogExceptionHandler.kt	81.08% <ø> (ø)
...id/webview/internal/rum/WebViewRumEventConsumer.kt	76.09% <75.00%> (-0.66%)	⬇️
...tadog/android/rum/internal/domain/RumDataWriter.kt	84.38% <87.50%> (-1.34%)	⬇️
...ndroid/telemetry/internal/TelemetryEventHandler.kt	90.91% <93.33%> (-1.15%)	⬇️
.../android/rum/internal/domain/scope/RumViewScope.kt	96.45% <93.91%> (-0.53%)	⬇️
...ndroid/rum/internal/domain/scope/RumActionScope.kt	98.58% <96.00%> (-0.70%)	⬇️
...roid/rum/internal/domain/scope/RumResourceScope.kt	97.06% <96.23%> (-0.95%)	⬇️
.../main/kotlin/com/datadog/android/rum/RumMonitor.kt	78.00% <100.00%> (+0.45%)	⬆️
...lin/com/datadog/android/rum/internal/RumFeature.kt	93.00% <100.00%> (-0.07%)	⬇️
...d/rum/internal/domain/scope/RumApplicationScope.kt	100.00% <100.00%> (ø)
... and 20 more