Add sent_at to envelope header item

[denrase]

📜 Description

• Add sent_at property to envelope header
• Set to current date before passing envelope to transport

💡 Motivation and Context

Relates to getsentry/sentry-dart#1337

Doc: https://develop.sentry.dev/sdk/envelopes/

💚 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

Add to cocoa sdk

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	366.92 ms	404.13 ms	37.21 ms
Size	1.73 MiB	2.27 MiB	551.93 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
33c80c7	318.88 ms	348.14 ms	29.26 ms
17ab223	427.65 ms	484.31 ms	56.65 ms
d81684e	235.73 ms	328.76 ms	93.03 ms
33c80c7	331.94 ms	370.54 ms	38.60 ms

App size

Revision	Plain	With Sentry	Diff
33c80c7	1.73 MiB	2.26 MiB	551.46 KiB
17ab223	1.73 MiB	2.34 MiB	626.85 KiB
d81684e	1.73 MiB	2.26 MiB	547.78 KiB
33c80c7	1.73 MiB	2.26 MiB	551.46 KiB

Previous results on branch: enha/envelope_header_sent_at

Startup times

Revision	Plain	With Sentry	Diff
5367e69	320.04 ms	363.33 ms	43.29 ms
7280518	283.38 ms	348.82 ms	65.44 ms
d8bf1ac	324.34 ms	364.22 ms	39.88 ms

App size

Revision	Plain	With Sentry	Diff
5367e69	1.73 MiB	2.27 MiB	551.83 KiB
7280518	1.73 MiB	2.27 MiB	551.83 KiB
d8bf1ac	1.73 MiB	2.26 MiB	550.51 KiB

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.17 🎉

Comparison is base (4d04310) 81.25% compared to head (13c0650) 81.42%.

❗ Current head 13c0650 differs from pull request most recent head 15151ba. Consider uploading reports for the commit 15151ba to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2638      +/-   ##
============================================
+ Coverage     81.25%   81.42%   +0.17%     
+ Complexity     4259     4231      -28     
============================================
  Files           337      337              
  Lines         15741    15640     -101     
  Branches       2079     2040      -39     
============================================
- Hits          12790    12735      -55     
+ Misses         2130     2110      -20     
+ Partials        821      795      -26     

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SentryClient.java	87.10% <ø> (ø)
...ry/transport/apache/ApacheHttpClientTransport.java	72.72% <100.00%> (+1.14%)	⬆️
.../src/main/java/io/sentry/SentryEnvelopeHeader.java	96.92% <100.00%> (+0.49%)	⬆️
...n/java/io/sentry/transport/AsyncHttpTransport.java	77.61% <100.00%> (+0.86%)	⬆️

... and 5 files with indirect coverage changes

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[markushi]

Looking good! I left a few comments for some minor improvements

[denrase]

Changed the implementation due to the discussion on the cocoa PR

getsentry/sentry-cocoa#2859

[romtsn]

thanks @denrase 👍