Introduce SecureHttpTransportParameters experimental API (to complement SecureTransportParameters counterpart)

[reta]

Description

Introduce SecureHttpTransportParameters experimental API (to complement SecureTransportParameters counterpart). The way we configure SSL Context in Reactor Netty 4 transport is not very clean and turned out to be fragile. By introducing SecureHttpTransportParameters (similarly with SecureTransportParameters), the transport could be configured in straightforward way.

Related Issues

Towards #18559

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[reta]

@andrross @cwperks if you have a second, small pull request to add SecureHttpTransportParameters (and add javadoc to SecureTransportParameters), thank you

[github-actions]

✅ Gradle check result for 0fed867: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.70%. Comparing base (7c8f01b) to head (0fed867).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../plugins/DefaultSecureHttpTransportParameters.java	0.00%	7 Missing ⚠️
...h/plugins/SecureHttpTransportSettingsProvider.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #18572      +/-   ##
============================================
+ Coverage     72.68%   72.70%   +0.01%     
+ Complexity    68130    68116      -14     
============================================
  Files          5540     5541       +1     
  Lines        313379   313387       +8     
  Branches      45472    45472              
============================================
+ Hits         227785   227835      +50     
+ Misses        67070    66981      -89     
- Partials      18524    18571      +47     

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