Adam

Method used to build prompts under the hood does not allow for full format customization

1

Currently method [`_build_prompt`](https://github.com/pallets/click/blob/main/src/click/termui.py#L60-L73) is implemented in very opinionated way regarding formatting how to display choices or default value. Considering how good of a job the rest of the features do...

Add format customization flow to `click.prompt` and `click.confirm` via `PromptBuilder` class

1

This PR implements a base class which allows to customize prompt format when used directly via `click.prompt` or `click.confirm` methods. It adds an optional parameter which can be an instance...