Add experimental JdkHttpSender

[jack-berg]

Resolves #5351.

[codecov]

Codecov Report

Patch coverage: 88.95% and project coverage change: -0.03 ⚠️

Comparison is base (7bd06ef) 91.32% compared to head (ad28caf) 91.29%.

❗ Current head ad28caf differs from pull request most recent head 06ff288. Consider uploading reports for the commit 06ff288 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5557      +/-   ##
============================================
- Coverage     91.32%   91.29%   -0.03%     
- Complexity     4953     4996      +43     
============================================
  Files           551      555       +4     
  Lines         14588    14752     +164     
  Branches       1357     1376      +19     
============================================
+ Hits          13322    13468     +146     
- Misses          876      888      +12     
- Partials        390      396       +6     

Impacted Files	Coverage Δ
...orter/sender/okhttp/internal/OkHttpHttpSender.java	98.43% <ø> (ø)
...ry/exporter/sender/jdk/internal/JdkHttpSender.java	87.36% <87.36%> (ø)
...ry/exporter/sender/jdk/internal/BodyPublisher.java	88.46% <88.46%> (ø)
...ry/exporter/internal/http/HttpExporterBuilder.java	93.65% <95.45%> (+1.49%)	⬆️
...ter/sender/jdk/internal/JdkHttpSenderProvider.java	100.00% <100.00%> (ø)
...nder/okhttp/internal/OkHttpHttpSenderProvider.java	100.00% <100.00%> (ø)

... and 14 files with indirect coverage changes

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[jkwatson]

Thanks!

[io7m]

Thank you!