[SR] Add beforeSendReplay callback

[romtsn]

:scroll: Description

• Add beforeSendReplay callback to allow attaching tags and modifying/dropping events analogous to beforeSend

:bulb: Motivation and Context

Part of https://github.com/getsentry/sentry/issues/74441

:green_heart: How did you test it?

Automated

:pencil: Checklist

• [x] I reviewed the submitted code.
• [x] I added tests to verify the changes.
• [x] No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• [] I updated the docs if needed.
• [x] Review from the native team if needed.
• [x] No breaking change or entry added to the changelog.
• [x] No breaking change for hybrid SDKs or communicated to hybrid SDKs.

:crystal_ball: Next steps

Docs

[github-actions[bot]]

Performance metrics :rocket:

	Plain	With Sentry	Diff
Startup time	413.47 ms	471.02 ms	57.55 ms
Size	1.70 MiB	2.35 MiB	669.38 KiB

Previous results on branch: rz/feat/session-replay-before-send

Startup times

Revision	Plain	With Sentry	Diff
debde9e6565992a2d3e391880b8a1f337ea948c3	441.62 ms	480.76 ms	39.14 ms
d16afa91f4b7b6cf6e19d873940d9dfb282bf109	356.98 ms	394.89 ms	37.91 ms

App size

Revision	Plain	With Sentry	Diff
debde9e6565992a2d3e391880b8a1f337ea948c3	1.70 MiB	2.35 MiB	668.66 KiB
d16afa91f4b7b6cf6e19d873940d9dfb282bf109	1.70 MiB	2.35 MiB	668.62 KiB