[EPIC] Tag spans if they contribute to TTID / TTFD

[markushi]

Idea: Identify spans as TTID or TTFD contributing spans to narrow down which spans actively contribute to screen load times.

See Notion doc for details:
https://www.notion.so/sentry/Data-Requirements-b4f616bac8bc449096a765f915e0a209?p=9b5a0979a81645789db6877593729cf4&pm=s

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1. [Starfish] Tag spans if they contribute to TTID / TTFD sentry-java#3252
   Platform: Android +1
   

[philipphofmann]

The screen load transactions should already contain all the information to determine which spans contribute to TTID/TTFD. Do you think further changes are required, @markushi?

[markushi]

The screen load transactions should already contain all the information to determine which spans contribute to TTID/TTFD. Do you think further changes are required, @markushi?

In the advent of span-only I don't think we have a guarantee that all required spans will be sent over in a single txn. Thus it could make sense to calculate those two fields on the SDK side.

@shruthilayaj what do you think about this?