[FEATURE] Support additional params in SecureTransportSettingsProvider to enable building of SslContext outside of security plugin

[rishabhmaurya]

Is your feature request related to a problem?
The netty's io.netty.handler.ssl.SslContext is needed by Flight server being introduced in opensearch-project/OpenSearch#16962. Today, it cannot be built outside of security plugin as SecureTransportSettingsProvider doesn't expose it.

What solution would you like?
Provide a way for consumers of SecureTransportSettingsProvider to build SslContext.
Since its a netty dependency which we don't want to add to server module thus we cannot build it in security plugin and expose it using SecureTransportSettingsProvider. Instead, expose all parameters needed to build SslContext to its consumer (plugins & modules) to build it directly.

What alternatives have you considered?
A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?
Add any other context or screenshots about the feature request here.

[cwperks]

[Triage] Thank you for filing this issue @rishabhmaurya . Can you elaborate on the parameters you would like to add and configure in SecureTransportSettingsProvider?

[rishabhmaurya]

@cwperks I will raise a PR for it, thank you. I will be adding following parameters to SecureTransportSettingsProvider.SecureTransportParameters. Please let me know if you have any concerns exposing them?

interface SecureTransportParameters {
        boolean dualModeEnabled();

        KeyManagerFactory keyManagerFactory();

        String sslProvider();

        String clientAuth();

        Iterable<String> protocols();

        Iterable<String> cipherSuites();

        TrustManagerFactory trustManagerFactory();
    }