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

[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 #12903, it is not an issue anymore and each transport could provide secure variants.

Describe the solution you'd like

Ensure support of secure native transports by transport-nio plugin. The complication here is that security plugin has hard dependency on Netty's SslHandler but transport-nio native transport does not use it.

Related component

Plugins

Describe alternatives you've considered

N/A

Additional context

See #12903

[andrross]

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