Implement webview proxy for cross platform

[louiszawadzki]

What does this PR do?

Adds internal function to consume web view events for cross-platform SDKs

Additional Notes

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 #1290 (f9dee9e) into develop (dde54aa) will increase coverage by 0.12%.
The diff coverage is 86.36%.

@@             Coverage Diff             @@
##           develop    #1290      +/-   ##
===========================================
+ Coverage    81.85%   81.97%   +0.12%     
===========================================
  Files          361      361              
  Lines        12835    12854      +19     
  Branches      2148     2151       +3     
===========================================
+ Hits         10506    10537      +31     
+ Misses        1665     1664       -1     
+ Partials       664      653      -11     

Impacted Files	Coverage Δ
...oid/src/main/kotlin/com/datadog/android/Datadog.kt	77.36% <0.00%> (ø)
.../main/kotlin/com/datadog/android/_InternalProxy.kt	89.66% <90.48%> (+9.66%)	⬆️
...android/log/internal/logger/TelemetryLogHandler.kt	85.71% <0.00%> (-14.29%)	⬇️
...droid/rum/tracking/FragmentViewTrackingStrategy.kt	75.00% <0.00%> (-3.85%)	⬇️
...n/com/datadog/android/v2/core/SdkInternalLogger.kt	88.89% <0.00%> (-2.78%)	⬇️
...id/rum/internal/ndk/DatadogNdkCrashEventHandler.kt	91.00% <0.00%> (-2.00%)	⬇️
...android/v2/core/internal/net/DataOkHttpUploader.kt	94.94% <0.00%> (ø)
.../android/rum/internal/monitor/DatadogRumMonitor.kt	89.42% <0.00%> (+0.53%)	⬆️
...ndroid/telemetry/internal/TelemetryEventHandler.kt	71.09% <0.00%> (+0.78%)	⬆️
.../kotlin/com/datadog/android/v2/core/DatadogCore.kt	85.59% <0.00%> (+0.85%)	⬆️
... and 6 more