[Feature Request]: Accepting user's JWT secret

[Bidon15]

Implementation ideas

During initialisation/restart phase, we should have a possibility for end users to inject their secret through the node cli/rpc-endpoint.

Ideally, during the initialisation phase, we can let setting up whatever secret with no restrictions whatsoever - can be a simple CLI flag

If during runtime, the user wants to rotate secrets - we should have a dedicated endpoint to do so and ask for the previous token as usual admin perms

[Bidon15]

This is beneficial for RaaS teams or whoever running da nodes with orchestration tools like k8s

[renaynay]

@Bidon15 what's priority on this?