add tree-sitter sources to languages.toml

Here we add syntax to the languages.toml languge

    [[grammar]]
    name = "<name>"
    source = { .. }

Which can be used to specify a tree-sitter grammar separately of
the language that defines it, and we make this distinction for
two reasons:

* In later commits, we will separate this code from helix-core
  and bring it to a new helix-loader crate. Using separate schemas
  for language and grammar configurations allows for a nice divide
  between the types needed to be declared in helix-loader and in
  helix-core/syntax

* Two different languages may use the same grammar. This is currently
  the case with llvm-mir-yaml and yaml. We could accomplish a config
  that works for this with just `[[languages]]`, but it gets a bit
  dicey with languages depending on one another. If you enable
  llvm-mir-yaml and disable yaml, does helix still need to fetch and
  build tree-sitter-yaml? It could be a matter of interpretation.

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