Add new CLI command to create `hook_specs.h`

[williamjamir]

Create a new CLI command named create-hook-specs that creates just the hook_specs.h

This command should check:

• If the destination folder already has the hook_specs.h, ask the user if they want to overwrite the file.

[tadeu]

What about naming it create-header or create-hook-specs-h in order to differentiate it from the "specs" themselves (the .py file)?