Add method to return dynamic SecureTransportParameters from SecureTransportSettingsProvider interface

[cwperks]

Description

Companion PR in the Security plugin: opensearch-project/security#4820

Fixes an issue with SSL Dual mode where the settings provider relies on the static node settings without taking dynamic cluster settings into account. This PR and companion Security PR fixes a regression introduced in opensearch-project/security#4119

Before 2.14, this setting was coming from the Security plugins SSLConfig class which originally gets the value from the node settings, but also registers a cluster settings listener to listen for dynamic updates to this setting.

For instance an operator can run:

curl -XPUT https://localhost:9200/_cluster/settings -k -H "Content-Type: application/json" -d '{"persistent": {"plugins.security_config.ssl_dual_mode_enabled": false}}'

To update this setting, but since 2.14 the dynamic value is not getting propagated.

This PR adds a new method to the SecureTransportSettingsProvider interface to allow a plugin that implements the provider to feed this value to core instead of relying on the static node settings.

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 174344b: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.93%. Comparing base (0bded88) to head (174344b).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16387      +/-   ##
============================================
- Coverage     72.07%   71.93%   -0.14%     
+ Complexity    64819    64756      -63     
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  Files          5307     5308       +1     
  Lines        302718   302730      +12     
  Branches      43734    43735       +1     
============================================
- Hits         218178   217765     -413     
- Misses        66638    67034     +396     
- Partials      17902    17931      +29     

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