Encode/Decode internal apollo3 headers

[lbloder]

📜 Description

Base64 encode/decode internal apollo3 headers

💡 Motivation and Context

Fixes #2680

💚 How did you test it?

📝 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	296.14 ms	309.60 ms	13.46 ms
Size	1.72 MiB	2.28 MiB	570.45 KiB

Previous results on branch: fix/apollo-3-header

Startup times

Revision	Plain	With Sentry	Diff
d9bd3b7	314.76 ms	355.60 ms	40.84 ms
3ecfb25	301.62 ms	368.38 ms	66.76 ms
bccb1ad	314.51 ms	380.98 ms	66.47 ms

App size

Revision	Plain	With Sentry	Diff
d9bd3b7	1.72 MiB	2.28 MiB	565.45 KiB
3ecfb25	1.72 MiB	2.28 MiB	570.00 KiB
bccb1ad	1.72 MiB	2.28 MiB	570.00 KiB

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: -0.01 ⚠️

Comparison is base (e9bec6e) 81.11% compared to head (84d12b0) 81.11%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2707      +/-   ##
============================================
- Coverage     81.11%   81.11%   -0.01%     
- Complexity     4445     4447       +2     
============================================
  Files           345      345              
  Lines         16387    16394       +7     
  Branches       2226     2226              
============================================
+ Hits          13293    13298       +5     
- Misses         2166     2168       +2     
  Partials        928      928              

Impacted Files	Coverage Δ
.../io/sentry/apollo3/SentryApollo3HttpInterceptor.kt	81.18% <80.00%> (-0.73%)	⬇️
...java/io/sentry/apollo3/SentryApollo3Interceptor.kt	64.28% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
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[adinauer]

Mostly LGTM. I think we should should handle decode exceptions directly in code, not sure Apollo fails the request if we throw out.