VERY rough first draft of context in ibl.

[Danielkonge]

This is a very rough first draft of an implementation of some kind of context in addition to scope in ibl. I don't have time to work more on this today, but please note that I am just uploading this to see if you already had any comments about changes you would want. This is not close to ready for a commit yet.

Right now the code is not cleaned up at all, and I will have to change a few things still. But I do have basically the behavior I want (see #649) now.

For this first draft most of context is just all copied from scope and then I made a few minor changes.

[lukas-reineke]

You basically just implemented scope = { include = { node_type = { ["*"] = { "*" } } } }.
But like I mentioned here #649 (comment) this has too many edge cases. It's not a good enough solution to build a whole feature on.

Please think about the algorithm first. I don't want you to waste time implementing all the other stuff. Without a good algorithm, I am not going to merge this.

[Danielkonge]

I will close this pull request for now and submit one without tree sitter for current indent highlighting. That one works on all my cases I tried, but it is slower.