feature: Allow adding a note to a tag

[ColinKennedy]

Did you check the docs?

• [X] I have read the Grapple docs

Is your feature request related to a problem? Please describe.

I use pretty granular scopes (sometimes git branch, sometimes not). When I use grapple a lot across branches, I may at times forget why I made a tag on a specific file / line.

Describe the solution you'd like

If I could define a comment on a specific tag and view it with require("grapple").open_tags() that'd be really nice. And maybe edit the comment from the same viewer

Describe alternatives you've considered

n/a

Additional context

Would likely require editing grapple.tag and of course editing the buffer that displays open_tags. And it may also be a good idea to show the note in Telescope grapple tags, too