[transport] Ensure support of the transport-nio by security plugin

[reta]

Is your feature request related to a problem? Please describe

The OpenSearch security plugin used to tightly integrates with the transport and supported TLS/SSL for transport-netty4 only. Since we've integrated https://github.com/opensearch-project/OpenSearch/issues/12903, it is not an issue anymore and each transport could provide secure variants.

Describe the solution you'd like

Ensure support of secure transports by transport-nio plugin

Related component

Plugins

Describe alternatives you've considered

N/A

Additional context

See https://github.com/opensearch-project/OpenSearch/issues/12903

[peternied]

[Triage - attendees 1 2 3 4 5 6 7] @reta Thanks for filing this issue