Support multiline tag descriptions via a text editor

[OpenBagTwo]

GIVEN Alex has gsb installed on her system and is using it to manage a game

WHEN she opens a terminal, navigates to the directory containing a gsb-managed save and runs the command:

$ gsb backup --tag

THEN her default* text editor will open up prompting her to provide a multiline message

SO that she can log all of the new and exciting things that happened between the last (tagged) backup and this one

Notes

*by "default" I mean:

1. Prefer an editor set explicitly via --editor
2. Then prefer any editor preferences set in the gsb config (if such a thing exists)
3. Then prefer her preferred git editor (git config core.editor)
4. Then prefer $EDITOR (or whatever the Windows equivalent is)
5. Then fall back to, like, nano/pico?

Looks like click supports this out-of-the-box

[OpenBagTwo]

So interestingly this already works in bash without any fanciness:

gsb backup --tag "Hello
> this is a multi-line
>
> tag annotation"