feat: implement a neo-tree source

[A-Lamia]

I think it could be cool to implement a neo-tree source so you could potentially have a side bar view of all your current tags.

This is not important nor do i believe it to be an imperative feature to be implemented, Just thought it could be an interesting idea so I'm creating this just to leave this as a note.

https://github.com/nvim-neo-tree/example-source

[cbochs]

This could be an interesting integration to include. I don't think this will be an priority for now, but would love to look into this later.

[cbochs]

I've implemented something that might achieve a similar result, where all your tags sit next to your working buffer. That is, sending scoped tags to the quickfix list. This can also be done directly from the popup menu.

I have found this to be superbly useful in my day-to-day workflow.

Neo-tree integration isn't still off the table, but I thought I'd bring this up as the current alternative.