add highlight support for tree-sitter-query language (tsq)

[the-mikedavis]

There's a tree-sitter parser for the .scm query DSL tree-sitter/tree-sitter-tsq and this PR adds it to the languages, along with highlight queries. Afaik there isn't an LSP for it though.

Here's what the highlights look like when highlighted by themselves 😄

^{(gruvbox theme)}

Here are some other examples from more complicated highlights...

The current Elixir highlights (with plenty of fields):

Nix highlights which use a few of what I have scoped as @operators

Notably it does (gracefully) fail to parse an escape_sequence in a regexp in the java (edit: and php) highlights:

But I think that's intended behavior: that regex should be "^_*[A-Z][A-Z\\d_]+$" in order to be interpreted correctly (separate PR incoming). It happens correctly highlight constants with digits because of the missing $ at the end.

(there's a similar regex in the ruby (1) and javascript (2) highlights:)

((constant) @constant
 (#match? @constant "^[A-Z]\\d_]+$"))

([
    (identifier)
    (shorthand_property_identifier)
    (shorthand_property_identifier_pattern)
 ] @constant
 (#match? @constant "^[A-Z_][A-Z\\d_]+$"))

The scope names in the highlights are pretty subjective and I'm certainly open to debate on all of them :)

[archseer]

This is great too! 👍🏻

Now all we need is a function to print out token trees to a document for debugging and it would make highlights very easy to develop :)