Git conflict markers in Blink Tree

[EvanKoe]

I have been using Blink Tree for a few months now, and as there is no documentation for it (see #14), it is quite hard to know if options exist. One of these options I was missing were a git conflict marker in the tree, like in nvim.tree (see picture from nvim.tree documentation).

Would that be doable ?

[saghen]

I would also love this! Since we get the git information asynchronously, and then render it with a decoration provider, we would need to use extmarks for this in that decoration provider. In theory, we already know if there's a conflict so this may be trivial to implement. I'm not planning on working on this anytime soon though, so if you'd like to write a PR, I'll happily review it when time permits!

[EvanKoe]

I also am kind of busy at work but if I find the time to do it, I'll make a PR then !