Fix app start span end-time is wrong if SDK init is deferred

[markushi]

This way the appstart start/end times are properly tracked, even if the
SDK is not initialized yet. In case of a deferred SDK init, the app
start span will be attached to the first tracked Activity after SDK
init.

💡 Motivation and Context

Fixes #2518

💚 How did you test it?

Unit 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]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	352.10 ms	385.02 ms	32.92 ms
Size	1.73 MiB	2.33 MiB	623.52 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
5fa24ec	326.29 ms	384.53 ms	58.24 ms
c1399c1	345.06 ms	385.49 ms	40.43 ms
754021c	358.70 ms	361.98 ms	3.28 ms
14c083a	350.82 ms	388.86 ms	38.04 ms
f6a135d	263.96 ms	383.59 ms	119.63 ms

App size

Revision	Plain	With Sentry	Diff
5fa24ec	1.73 MiB	2.33 MiB	620.61 KiB
c1399c1	1.73 MiB	2.33 MiB	620.61 KiB
754021c	1.73 MiB	2.33 MiB	623.06 KiB
14c083a	1.73 MiB	2.33 MiB	620.61 KiB
f6a135d	1.73 MiB	2.33 MiB	623.10 KiB

Previous results on branch: fix/app-start-time-deferred-sdk-init

Startup times

Revision	Plain	With Sentry	Diff
8a9e6d9	320.86 ms	362.48 ms	41.62 ms
15e2361	321.98 ms	390.90 ms	68.92 ms
301557d	310.90 ms	362.35 ms	51.46 ms
0a8bf63	313.18 ms	355.65 ms	42.47 ms
099f7ad	361.06 ms	364.21 ms	3.15 ms

App size

Revision	Plain	With Sentry	Diff
8a9e6d9	1.73 MiB	2.33 MiB	623.40 KiB
15e2361	1.73 MiB	2.33 MiB	623.40 KiB
301557d	1.73 MiB	2.33 MiB	623.40 KiB
0a8bf63	1.73 MiB	2.33 MiB	623.39 KiB
099f7ad	1.73 MiB	2.33 MiB	623.40 KiB

[codecov]

Codecov Report

Base: 80.18% // Head: 80.18% // No change to project coverage 👍

Coverage data is based on head (5b10d84) compared to base (754021c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2519   +/-   ##
=========================================
  Coverage     80.18%   80.18%           
  Complexity     3943     3943           
=========================================
  Files           323      323           
  Lines         14896    14896           
  Branches       1965     1965           
=========================================
  Hits          11944    11944           
  Misses         2178     2178           
  Partials        774      774           

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[romtsn]

lgtm 👍 a couple of minor comments

[romtsn]

@marandaneto would you like to take a look at this? Was there a reason why we have not capture the app start span end time in the same provider where we capture the start time?

[marandaneto]

@marandaneto would you like to take a look at this? Was there a reason why we have not capture the app start span end time in the same provider where we capture the start time?

Most likely because we offer the possibility of no content providers (docs tell how to remove them).
Also because Hybrid SDKs finish the app start by themselves (checking their own screen visibility).
The current approach might be a problem for the later, it has to be checked.