[SR] Fix memory leak in Compose masking

[romtsn]

📜 Description

Use WeakReference to store root coordinates and add a test for leaks in replay

💡 Motivation and Context

Closes #3915

💚 How did you test it?

Manually + automated

📝 Checklist

• 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.
• I updated the wizard 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]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	617.60 ms	741.08 ms	123.48 ms
Size	1.70 MiB	2.36 MiB	672.21 KiB

Previous results on branch: rz/fix/session-replay-leak

Startup times

Revision	Plain	With Sentry	Diff
ad8d4f6	436.69 ms	535.08 ms	98.39 ms
8ba5fb7	407.10 ms	443.43 ms	36.33 ms
6b64771	388.73 ms	416.23 ms	27.50 ms
216c007	405.88 ms	407.52 ms	1.64 ms
fc84278	400.59 ms	424.42 ms	23.83 ms

App size

Revision	Plain	With Sentry	Diff
ad8d4f6	1.70 MiB	2.36 MiB	672.21 KiB
8ba5fb7	1.70 MiB	2.36 MiB	672.25 KiB
6b64771	1.70 MiB	2.36 MiB	672.25 KiB
216c007	1.70 MiB	2.36 MiB	672.21 KiB
fc84278	1.70 MiB	2.36 MiB	672.25 KiB

[stefanosiano]

nice