[FEATURE] Support for HTTP/3 (server side)

[reta]

Description

Adds support of the HTTP/3 transport by OpenSearch security plugin.

Issues Resolved

Closes #5884, depends on opensearch-project/OpenSearch#20017

Testing

• tested on locally built distribution with security plugin and netty4 transport (default)
• tested on locally built distribution with security plugin and reactor-netty4 transport
• the test cases strategy TDB since we do not have client-side support yet

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[reta]

Minor fix submitted opensearch-project/OpenSearch#20394

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.69%. Comparing base (70e03b2) to head (9d6b3cc).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/security/OpenSearchSecurityPlugin.java	20.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5886      +/-   ##
==========================================
+ Coverage   73.67%   73.69%   +0.01%     
==========================================
  Files         437      437              
  Lines       26655    26659       +4     
  Branches     3945     3946       +1     
==========================================
+ Hits        19639    19647       +8     
+ Misses       5141     5137       -4     
  Partials     1875     1875              

Files with missing lines	Coverage Δ
.../opensearch/security/OpenSearchSecurityPlugin.java	84.96% <20.00%> (-0.42%)	⬇️

... and 7 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[reta]

@willyborankin wondering if you could take a look, trivial one, thank you!