The Operator should easily support custom feast project/repo code

Is your feature request related to a problem? Please describe.
Currently, the operator can only configure a very basic feast repo via feast init. In order to add custom code, kubectl exec must be used and its not straightforward.

Describe the solution you'd like
There should be an OOB solution that allows a user to point to an existing git repo, or use one of the many supported templates during feast init