prompt: add enum picker and prompts for fields

I've been using [cz-cli](https://github.com/commitizen/cz-cli) and have just tried out `commitlint/prompt`. Something that `commitlint/prompt` offers that I wish existed in `cz-cli` is the character count for the `type`/`scope`/`subject`. On the other hand, I really like `cz-cli`'s ability to prompt for every part of the commit message (`type`, `scope`, `subject` etc) with individualized instructions. `cz-cli` also offers a picker for the commit type with explanation of each option. It'd be fantastic if `commitlint` can incorporate those great features from `cz-cli`.