Support JWT/NKeys authentication for nats EDFS

[seancribbs]

Component(s)

router

Is your feature request related to a problem? Please describe.

We are intending to use NATS for event-driven federation subscriptions (EDFS), but the connector only supports token or username/password authentication.

Describe the solution you'd like

We would like to configure the router to use a .creds (JWT + seed pair) file from the local filesystem to authenticate to our NATS cluster which is being administered using the operator/account/user hierarchy.

Describe alternatives you've considered

We could enable token or username/password authentication but this would require us to reload the router and NATS cluster anytime the credentials need to be rotated, whereas the JWT solution allows us to more dynamically create and revoke credentials.

Additional context

Relevant NATS documentation: https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/jwt

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[StarpTech]

Hi @seancribbs, thanks for your contribution. We'll look into it and come back.