[ANR] Defer some class availability checks

[stefanosiano]

📜 Description

added lazy class available check to LoadClass
lazy checking available classes in:

• ActivityFramesTracker
• AndroidViewGestureTargetLocator
• UserInteractionIntegration

💡 Motivation and Context

Checking if a class exists uses reflection, which can be slow especially during app startup. Deferring some calls, we can improve SDK init time

💚 How did you test it?

📝 Checklist

• I added GH Issue ID & Linear ID
• 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	371.35 ms	410.53 ms	39.18 ms
Size	1.58 MiB	2.12 MiB	549.60 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
b3d8889	420.46 ms	453.71 ms	33.26 ms
ee747ae	386.94 ms	431.43 ms	44.49 ms
ee747ae	400.46 ms	423.61 ms	23.15 ms
9fbb112	361.43 ms	427.57 ms	66.14 ms
cf708bd	408.35 ms	458.98 ms	50.63 ms
ee747ae	396.82 ms	441.67 ms	44.86 ms
cf708bd	434.73 ms	502.96 ms	68.22 ms
bdbe1f4	380.66 ms	464.44 ms	83.78 ms
806307f	357.85 ms	424.64 ms	66.79 ms
f634d01	375.06 ms	420.04 ms	44.98 ms

App size

Revision	Plain	With Sentry	Diff
b3d8889	1.58 MiB	2.10 MiB	535.07 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
9fbb112	1.58 MiB	2.11 MiB	539.18 KiB
cf708bd	1.58 MiB	2.11 MiB	539.71 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
cf708bd	1.58 MiB	2.11 MiB	539.71 KiB
bdbe1f4	1.58 MiB	2.11 MiB	538.88 KiB
806307f	1.58 MiB	2.10 MiB	533.42 KiB
f634d01	1.58 MiB	2.10 MiB	533.40 KiB

[stefanosiano]

Performance gains in release builds for init():
High end device: negligible - around ~0.2 ms
Low end device: low - around ~3 ms

[romtsn]

LGTM, with one thing in UserInteractionIntegration