BREAKING: Add --version back and deprecate cz version --commitizen which is the default for cz version #1785

Description

cz version is evolving into a more complete version explorer.
The problem is that right now, you need to provide a --project flag, otherwise you get commitizen's version.
We would like to make it the default.

Possible Solution

1. Add --version back, which outputs commitizen's version.
2. BREAKING PART: Remove cz version --comitizen and make cz version default to --project (keep --project for backwards compatibility)
3. BREAKING PART 2: Remove --project (optional, we could just document that it's a legacy flag, to prevent people from changing their workflows)

Additional context

No response

Related issues

See #1724 #1779