[QA] Make replay lazy and faster

[romtsn]

📜 Description

• There are some things we were eagerly initializing for replay that we actually don't need (and only use them on a bg thread, so this should be a good improvement)
• Use Class.getName instead of Class.getCanonicalName as seems like the latter is quite a bit slower due to checks for class locality/anonymity which goes into the native layer. Maybe an outlier, but they are essentially the same thing except a couple of cases, so I think it's fine to use it here
• Get rid of unnecessary positionInWindow call as we already get the coords via boundsInWindow anyway
• Get rid of runInBackground init call as it wouldn't do anything because ReplayCache is null at that point anyway

Before (canonicalName change)

After (canonicalName change)

💚 How did you test it?

Existing tests should cover it

📝 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]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	446.71 ms	556.78 ms	110.06 ms
Size	1.70 MiB	2.35 MiB	667.98 KiB

Previous results on branch: rz/fix/slow-replay-main-thread

Startup times

Revision	Plain	With Sentry	Diff
0bd8123	447.78 ms	452.78 ms	5.00 ms

App size

Revision	Plain	With Sentry	Diff
0bd8123	1.70 MiB	2.35 MiB	667.98 KiB