[SR] Support replays for crashes in buffer and session modes

[romtsn]

#skip-changelog

📜 Description

• Make buffer mode work for ANRs
  • For that we have to store errorSampleRate to disk and then roll the dice on next launch, because it could change in the meantime
  • Also, since in buffer mode we don't actually write replayId to scope until an error happens (and in the case of an ANR we don't know until next restart), the persisted replayId to disk might be irrelevant. So we have to iterate through the leftover replay folders and find the one that was last modified closest to the ANR and take it as the previous replay
  • Important part is: we set the relevant replayId back to the disk cache, so later ReplayIntegration can pick it up and finalize and send it. The order will be ensured by an integration test
• Make buffer mode work for Crashes
  • Renamed sendReplayForEvent to captureReplay which just accept one argument now to define whether the app process is terminating or not. If it is, then we don't capture the buffered replay in the current process, but will capture it on next launch, to avoid weird issues with half-captured videos
  • Refactored createSegment method and moved it to a static method under CaptureStrategy so we could call it from ReplayIntegration as well
• Small fix for network breadcrumbs where we could deserialize double values sometimes (didn't want to change the deserializer for that to not break something accidentally)
• Small fix for the video encoder, set IFRAME_INTERVAL to -1 so it always only encode partial updates without full frames to save the video size

💡 Motivation and Context

Part of getsentry/sentry#74441

💚 How did you test it?

manually + automated

📝 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.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	425.89 ms	494.59 ms	68.70 ms
Size	1.70 MiB	2.35 MiB	659.95 KiB

Baseline results on branch: rz/feat/session-replay-anrs

Startup times

Revision	Plain	With Sentry	Diff
c08178b	463.49 ms	521.56 ms	58.07 ms
67eeea2	418.83 ms	468.14 ms	49.31 ms
cde588a	434.92 ms	521.49 ms	86.57 ms
1a9eb03	380.06 ms	449.65 ms	69.59 ms
80061b7	395.55 ms	462.64 ms	67.09 ms
11e9a81	384.38 ms	469.45 ms	85.07 ms
eb8377e	325.29 ms	378.86 ms	53.57 ms

App size

Revision	Plain	With Sentry	Diff
c08178b	1.70 MiB	2.34 MiB	657.87 KiB
67eeea2	1.70 MiB	2.34 MiB	657.87 KiB
cde588a	1.70 MiB	2.34 MiB	658.00 KiB
1a9eb03	1.70 MiB	2.34 MiB	657.61 KiB
80061b7	1.70 MiB	2.34 MiB	658.13 KiB
11e9a81	1.70 MiB	2.34 MiB	658.20 KiB
eb8377e	1.70 MiB	2.34 MiB	658.10 KiB

Previous results on branch: rz/feat/session-replay-crashes

Startup times

Revision	Plain	With Sentry	Diff
f92f141	409.55 ms	490.19 ms	80.65 ms
828b30b	446.63 ms	539.67 ms	93.04 ms
2e2a18e	543.10 ms	617.62 ms	74.52 ms

App size

Revision	Plain	With Sentry	Diff
f92f141	1.70 MiB	2.34 MiB	659.63 KiB
828b30b	1.70 MiB	2.35 MiB	660.25 KiB
2e2a18e	1.70 MiB	2.34 MiB	659.62 KiB

[markushi]

Nice one, great to see this all coming together. Left a few minor comments