RUM-5841 feat(view-loading-api): introduce telemetry for the API and overwrite flag

[ganeshnj]

What and why?

https://datadoghq.atlassian.net/wiki/spaces/RUMP/pages/3951001790/RFC+View+loading+time+manual+API

How?

• Integration of the telemetry events
  • happy path
  • when there is overwrite
  • when there the current view is not active
  • when there is no view scope
• overwrite argument to the API

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

[datadog-datadog-prod-us1]

Datadog Report

Branch report: ganeshnj/feat/view-loading-api-tel
Commit report: 680e7f2
Test service: dd-sdk-ios

✅ 0 Failed, 3432 Passed, 0 Skipped, 2m 23.05s Total Time
🔻 Test Sessions change in coverage: 12 decreased, 2 increased

🔻 Code Coverage Decreases vs Default Branch (12)

This report shows up to 5 code coverage decreases.

• test DatadogLogsTests tvOS 46.79% (-1.19%) - Details
• test DatadogLogsTests iOS 46.73% (-1.19%) - Details
• test DatadogCrashReportingTests tvOS 26.6% (-0.32%) - Details
• test DatadogCrashReportingTests iOS 26.57% (-0.3%) - Details
• test DatadogInternalTests iOS 79.51% (-0.14%) - Details

[ncreated]

Well done, especially the work on sample rate 👍. I believe the "is active" view consideration is not entirely correct in RUMViewScope. I left comments, LMKWDYT.