fix: replace kdl tree-sitter to fix highlighting

[cgahr]

The tree-sitter for the kdl language currently being used contains bugs.

Consider the following kdl config:

bigFlatItems "multiline \" \" \"\nstring\n" null
c "multiline string\nwith special characters:\n\t \n \" \"\n"

With the current tree-sitter implementation, escaped double quotes \" are being detected as characters ending a string. As such, they are improperly highlighted.

I propose to change the used implementation to https://github.com/amaanq/tree-sitter-kdl. It seems to be more up to date, more activate and highlights the previous example correctly.

[the-mikedavis]

The queries in runtime/queries/kdl/*.scm will need to be updated to match the new grammar. For example cargo xtask query-check is currently failing because the queries match a comment node which doesn't exist in the new grammar (it has a single_line_comment node instead https://github.com/amaanq/tree-sitter-kdl/blob/e180e05132c4cb229a8ba679b298790ef1eca77c/grammar.js#L291)

[cgahr]

Thanks for your comments. I updated highlights.scm to match the new tree-sitter. I had to remove bare_identifier since it does not exist (is not public) in the new tree-sitter.

Also, I added indent queries.

[cgahr]

I added text object queries for tree sitter navigation:

• class.* and function.* behave the same but the movement
• both match the full node, inside the inside of the brackets, around the full surrounding node
• class.movement moves to the next node
• function.movement moves to the next identifier, I think this is very useful to cycle identifiers and is not bound to the hierarchy (in contrast to class.movement)
• parameter work as well. inside selects the parameter, around the parameter with type if
• parameter.movement moves to the next parameter without type, I think this matches the most common use-case of only editing the parameter without type
• comment matching works too, however, comment.around for single line comments only selects the same and previous lines, not the following ones too. I don't know how to fix that.
• lastly, test.* matches the types of values; tests don't exist in kdl and this type of movement might be useful but probably not very common.

I also added indents, they just work.

Lastly, I slightly improved the syntax highlighting. node identifiers are now variable colored, which afaik is normally the most common color, white. This removes colors, with them being the most common element of kdl documents, and removes color clashes with type annotations. Also, types and their brackets are differently colored.