feat: floating window for blame message

[davidgao7]

hello!

I found it's kind of hard to see the full commit message when using virtual text, so I created a command to display a floating window so we don't have to resize my terminal every time

[jinzhongjia]

@f-person Hey, bro. Can we merge this PR?
I think this is a great feat!

[davidgao7]

Any updates guys?

[f-person]

hi! thanks for the PR! it's a nice idea, and it would be great to add a floating window to the plugin at some point.
however, i checked it, and it's not ready to merge as-is, because the implementation is incomplete.
mainly, the UX around the blame message window is poor (e.g., the command opens the window, but it doesn't, for example, disappear once cursor is moved elsewhere or it doesn't follow the cursor). not fully sure what the ideal UX should be either.
also, there should be configuration options for what to show in the floating window.

i might pick it up myself sometime, after i see how other plugins usually implement the floating window UX