[SR] Capture network requests

[romtsn]

#skip-changelog

📜 Description

• Adds RRWebSpanEvent and transforms our breadcrumbs from the scope to these, filtered by the replay segment timespan
• Had to add start_timestamp/end_timestamp to the http breadcrumbs data bag, because we expect "spans" with start and end time on the frontend side for network requests
• Small fix for MapObjectReader where nextObjectOrNull would not remove the last entry from stack
• Adds missing rrweb events to ReplayRecordingTest

💡 Motivation and Context

Part of getsentry/sentry#63255

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	379.35 ms	452.93 ms	73.58 ms
Size	1.70 MiB	2.32 MiB	635.59 KiB

Baseline results on branch: rz/feat/session-replay-public-api

Startup times

Revision	Plain	With Sentry	Diff
120668a	363.11 ms	441.60 ms	78.49 ms
a82aaa3	341.67 ms	403.26 ms	61.59 ms

App size

Revision	Plain	With Sentry	Diff
120668a	1.70 MiB	2.32 MiB	633.47 KiB
a82aaa3	1.70 MiB	2.32 MiB	633.46 KiB

Previous results on branch: rz/feat/session-replay-network-requests

Startup times

Revision	Plain	With Sentry	Diff
331bc76	425.82 ms	504.04 ms	78.22 ms

App size

Revision	Plain	With Sentry	Diff
331bc76	1.70 MiB	2.32 MiB	635.66 KiB

[markushi]

Nice, looking good! Left a few minor comments.