Replace imports of pure click with rich-click

[yarikoptic]

Should provide better handling for wider terminals, add some colors etc

TODOs:

• fix up tests
• potentially see additional improvements, like better listing of "Choices" values like for download --existing which transpired this PR
• fix up entries for listing instances, apparently works out the \b a little different

@dandi/dandi-cli @dandi/archive-maintainers anyone used this https://github.com/ewels/rich-click ?