This change adds contrib/internal/treesitter/update-queries.py, which

can go into an nvim-treesitter checkout and pull out highlights and

injections queries.
neovim supports an "inherits" key in queries files, which will merge

queries at runtime. This script will do that same inheritance, but it

just merges at the time of the script invocation. This makes our runtime

a bit faster and simpler at the expense of slightly inflated file sizes.
There's a fairly tight correlation between a grammar implementation and

queries for that grammar. Because nvim-treesitter and

tree-sitter-language-pack don't always agree on which version of a

grammar to use (or even the specific implementation of a grammar for a

given language), some queries may not work properly. This script

therefore has some extra complexity:

We have a blacklist of languages which we know we don't want to get

  from nvim-treesitter. In most cases these are cases where there are

  multiple grammar implementations for a given language and the one

  used in nvim is different from the one in tree-sitter-language-pack.
For languages where it's using the same grammar implementation, the

  versions may be incompatible (for example, the highlights may depend

  on node types that are introduced in a grammar version later than the

  one tree-sitter-language-pack ships). In these cases, we'll look

  through the commit history and attempt to find a historical version of

  the queries that will load. This doesn't work for all languages, so

  I'm still working through what to do for those cases.

Ran the script and verified that the resulting queries files are

correct.