Feat: Add support for cert-manager

[jp-gouin]

Is your feature request related to a problem? Please describe. For production environment , it's best to verify the certificate during the replication between each nodes. Currently this is only possible by bringing our own certificate.

Describe the solution you'd like Add a certificate resource for cert-manager support. Need to input the issuerRef. dnsNames can be computed automatically using the services name, headless + replica count

The value could look like :

initTLSSecret:
...
  certManager: 
    issuerRef:
        name: selfsigned-ca
        kind: Issuer

(Feel free to upvote it, so I can get a sense at how useful it can be :) )