Bring `cz --version` back and deprecate `cz version --commitizen`

[bearomorphism]

Description

Commitizen used to have cz --version, but it is removed.

• Check why it is removed (maybe @Lee-W remember why)

Possible Solution

No response

Additional context

No response

Related issues

No response

[Lee-W]

This was an intentional design. Kinda forget the details. Will need some digging.

[bearomorphism]

b4508a9

[bearomorphism]

I only found the commit but I haven't found why that was removed.