Slow and frozen frames + frame delay for Spans

[markushi]

📜 Description

As discussed we want to move away from ActivityFramesTracker and use our SentryFrameMetricsCollector instead.

This class extends the DefaultTransactionPerformanceCollector to support collecting snapshots (existing impl for polling cpu/memory every 100ms) as well as in a "continuous" fashion, for slow and frozen frames.

Steps taken:

1. Added frame delay to SentryFrameMetricsCollector
2. Have a single SentryFrameMetricsCollector object, living in SentryAndroidOptions
3. Added IPerformanceCollectorInterface with IPerformanceSnapshotCollector (previously ICollector) and IPerformanceContinuousCollector sub interfaces
4. Extended DefaultTransactionPerformanceCollector to support both interfaces
5. Added AndroidSlowFrozenFrameCollector which collects and aggregates the frame metrics for every span

Still Missing:

1. AndroidSlowFrozenFrameCollector aggregation logic
2. Tests

💚 How did you test it?

TBD

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Slow and frozen frames + frame delay for Spans ([#3081](https://github.com/getsentry/sentry-java/pull/3081))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

Generated by 🚫 dangerJS against bb09cdf

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	361.56 ms	399.40 ms	37.84 ms
Size	1.72 MiB	2.27 MiB	557.89 KiB

Baseline results on branch: feat/app-start-spans

Startup times

Revision	Plain	With Sentry	Diff
3fd1e60	390.54 ms	446.90 ms	56.36 ms
6cd4f31	389.94 ms	445.81 ms	55.87 ms
5f1218e	408.20 ms	466.26 ms	58.06 ms

App size

Revision	Plain	With Sentry	Diff
3fd1e60	1.72 MiB	2.27 MiB	557.21 KiB
6cd4f31	1.72 MiB	2.27 MiB	557.15 KiB
5f1218e	1.72 MiB	2.29 MiB	580.44 KiB

Previous results on branch: feat/slow-frozen-frames

Startup times

Revision	Plain	With Sentry	Diff
5362676	411.22 ms	549.20 ms	137.98 ms

App size

Revision	Plain	With Sentry	Diff
5362676	1.72 MiB	2.27 MiB	557.84 KiB

[markushi]

Closing in favor of multiple smaller PRs