cz-commitlint: Multiple scopes cannot be disabled when using scope-enum

[CJKay]

#2782 introduced support for multiple scopes (e.g. feat(abc,xyz): ...), and with it changed the format of the scope selection prompt in cz-commitlint from a single-select radio list to a multiple-select checkbox list when the scope-enum rule has been configured.

However, not all projects that use the scope-enum rule wish to enable multiple scopes (to prevent duplicate entries in the changelog under distinct sub-sections, for example). At present, there's no option to configure whether commitlint (and Commitizen when using cz-commitlint) permits multiple scopes.

Expected Behavior

commitlint should introduce a new configuration option (multiple-scopes?) to configure whether multiple scopes are supported. When multiple-scopes are disabled, usage of multiple scopes should cause an error during linting, and cz-commitlint should present the user with a radio list instead of a checkbox list.

Current Behavior

There is no option to configure support for multiple scopes, so cz-commitlint always presents a checkbox list and always accepts multiple scopes if scope-enum is configured.

[curly210102]

@CJKay Thanks for feedback, I'll add option to config it.

[escapedcat]

Released with v16.0.0