Rich go template files in init/plugin

### Plugin(s)

general

### What/How do you want to enhance?

Init these files when initializing a new plugin.
- main.go
- deployment/plugin.go : with initializing APIs






### Why do you want to enhance?

To make it much easier to get started developing.

### Alternatives you've considered but not suggested

_No response_

### Additional context

_No response_