Add ttid/ttfd contribution flags

[markushi]

📜 Description

Attaches the ttid/ttfd contribution flags to all spans within a txn, if the txn contains a ttid/ttfd span.

💡 Motivation and Context

Relevant docs PR: https://github.com/getsentry/develop/pull/1250/files
Relevant discussion on Notion: https://www.notion.so/sentry/span-contribution-9b5a0979a81645789db6877593729cf4

💚 How did you test it?

Added tests

📝 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]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 7a040c0

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	403.85 ms	471.84 ms	67.98 ms
Size	1.70 MiB	2.28 MiB	592.53 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
0810952	364.51 ms	468.08 ms	103.57 ms
61981dc	388.65 ms	454.96 ms	66.31 ms
baaf637	428.12 ms	520.40 ms	92.28 ms
1ae2ec6	353.85 ms	419.71 ms	65.85 ms
c7e2fbc	377.85 ms	426.35 ms	48.50 ms
b172d4e	412.60 ms	492.68 ms	80.08 ms
4e260b3	378.73 ms	454.18 ms	75.45 ms
93a76ca	377.41 ms	448.22 ms	70.81 ms
93a76ca	381.08 ms	459.22 ms	78.14 ms
7b7964f	363.27 ms	455.32 ms	92.05 ms

App size

Revision	Plain	With Sentry	Diff
0810952	1.72 MiB	2.27 MiB	558.21 KiB
61981dc	1.70 MiB	2.28 MiB	592.12 KiB
baaf637	1.72 MiB	2.27 MiB	558.42 KiB
1ae2ec6	1.70 MiB	2.27 MiB	584.63 KiB
c7e2fbc	1.72 MiB	2.29 MiB	576.40 KiB
b172d4e	1.72 MiB	2.29 MiB	578.09 KiB
4e260b3	1.72 MiB	2.27 MiB	554.95 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
7b7964f	1.70 MiB	2.28 MiB	592.12 KiB

Previous results on branch: feat/app-start-ttid-ttfd-span-tagging

Startup times

Revision	Plain	With Sentry	Diff
4fa2c56	403.10 ms	527.82 ms	124.72 ms
6a610ad	384.41 ms	441.60 ms	57.19 ms

App size

Revision	Plain	With Sentry	Diff
4fa2c56	1.70 MiB	2.28 MiB	592.53 KiB
6a610ad	1.70 MiB	2.28 MiB	592.50 KiB

[romtsn]

probably: for TTID - yes, for TTFD - no, also should consider background ones

[romtsn]

LGTM!