WIP: Flutter replay

[vaind]

📜 Description

Adds session replay support for Flutter (Android, iOS)

💡 Motivation and Context

closes #1193

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

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

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

- Flutter replay ([#2011](https://github.com/getsentry/sentry-dart/pull/2011))

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 46a96b0

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

ktlint

flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|205 col 1| Unexpected indentation (10) (should be 6)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|355 col 1| Unexpected indentation (6) (should be 4)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|382 col 1| Unexpected indentation (8) (should be 6)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|382 col 9| Newline expected after opening parenthesis
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|383 col 1| Unexpected indentation (8) (should be 6)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|383 col 9| Parameter should start on a newline
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|384 col 1| Unexpected indentation (8) (should be 6)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|384 col 9| Parameter should start on a newline
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|412 col 1| Unexpected indentation (8) (should be 6)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|413 col 1| Unexpected indentation (12) (should be 8)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|414 col 1| Unexpected indentation (12) (should be 8)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|415 col 1| Unexpected indentation (12) (should be 8)
flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt|416 col 1| Unexpected indentation (8) (should be 6)

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	374.86 ms	417.83 ms	42.97 ms
Size	6.33 MiB	7.39 MiB	1.05 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d53c6fa	282.83 ms	344.00 ms	61.17 ms
ef31c7f	311.39 ms	359.33 ms	47.94 ms
eecbbca	324.37 ms	352.49 ms	28.12 ms
48adddf	353.96 ms	431.10 ms	77.14 ms
b0811cc	580.00 ms	675.69 ms	95.69 ms
89ea268	320.35 ms	377.68 ms	57.33 ms
ccc09e4	308.21 ms	357.74 ms	49.54 ms
d089990	361.67 ms	442.50 ms	80.83 ms
2331d89	352.45 ms	417.34 ms	64.89 ms
1a93825	347.31 ms	424.54 ms	77.23 ms

App size

Revision	Plain	With Sentry	Diff
d53c6fa	6.16 MiB	7.14 MiB	1011.18 KiB
ef31c7f	6.06 MiB	7.09 MiB	1.03 MiB
eecbbca	5.94 MiB	6.89 MiB	975.78 KiB
48adddf	6.27 MiB	7.20 MiB	959.09 KiB
b0811cc	6.33 MiB	7.27 MiB	954.02 KiB
89ea268	6.06 MiB	7.03 MiB	989.24 KiB
ccc09e4	5.94 MiB	6.95 MiB	1.01 MiB
d089990	6.34 MiB	7.28 MiB	967.79 KiB
2331d89	5.94 MiB	6.96 MiB	1.02 MiB
1a93825	6.27 MiB	7.20 MiB	956.36 KiB

[vaind]

I've used jni & jnigen here to integrate with native sentry-java replay support for Android. However, in order to make callbacks work, we need at least jni/jnigen v0.6.0 which would increase our minimum supported SDK version to Flutter 3.13. Therefore, I'm closing this and will create a new PR that uses method channels for Java.