Consul tls command should be able to renew

[reskin89]

Feature Description

Currently the consul tls command only has create functionality for a server certificate. However, to avert having to distribute a new trust chain to all clients, it would be helpful if this also had a consul tls renew that took the current certificate and key, and generated a new certificate that its CA chain resolves to, to avoid a service disruption to clients.

Use Case(s)

Renewing a Consul TLS Server Certificate with minimal impact to registered nodes.

[vijayraghav-io]

Hi @reskin89, We have similar issue to alert about TLS expiry in UI https://github.com/hashicorp/consul/issues/19358 and the PR for that https://github.com/hashicorp/consul/pull/19427

Its good suggestion to have renew command as well, looking into this.