Add HTTP/2 protocol support to HttpRequest.HttpVersion

[reta]

Description

Add HTTP/2 protocol support to HttpRequest.HttpVersion

Related Issues

N/A

Check List

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

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[github-actions]

✅ Gradle check result for c8081ec: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.30%. Comparing base (b82ed5a) to head (c8081ec).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../org/opensearch/http/netty4/Netty4HttpRequest.java	0.00%	2 Missing ⚠️
.../http/reactor/netty4/ReactorNetty4HttpRequest.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17248      +/-   ##
============================================
+ Coverage     72.29%   72.30%   +0.01%     
- Complexity    65699    65714      +15     
============================================
  Files          5318     5318              
  Lines        305676   305681       +5     
  Branches      44350    44352       +2     
============================================
+ Hits         220992   221033      +41     
+ Misses        66582    66552      -30     
+ Partials      18102    18096       -6     

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