RUM-4133 Propagate device and os info to all metrics

[maciejburda]

What and why?

A short description of what changes this PR introduces and why.

How?

A brief description of implementation details of this PR.

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

Custom CI job configuration (optional)

• [ ] Run unit tests for Core, RUM, Trace, Logs, CR and WVT
• [ ] Run unit tests for Session Replay
• [ ] Run integration tests
• [ ] Run smoke tests
• [ ] Run tests for tools/

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: maciey/RUM-4133-metrics-update Commit report: a7f8a59 Test service: dd-sdk-ios

:white_check_mark: 0 Failed, 3233 Passed, 0 Skipped, 2m 25.2s Total Time :small_red_triangle_down: Test Sessions change in coverage: 9 decreased, 1 increased (+0.23%), 3 no change

:small_red_triangle_down: Code Coverage Decreases vs Default Branch (9)

This report shows up to 5 code coverage decreases.

• test DatadogCoreTests iOS 73.65% (-0.31%) - Details
• test DatadogRUMTests tvOS 81.27% (-0.2%) - Details
• test DatadogTraceTests tvOS 54.94% (-0.19%) - Details
• test DatadogRUMTests iOS 81.23% (-0.05%) - Details
• test DatadogInternalTests iOS 80.02% (-0.05%) - Details