consider wasm based lexers

[ratmice]

Currently this requires file based actionless lexing in #21 I would really rather use rust-like raw string literals,
e.g. where r##"r#""#"## is the string "r#""#" than toml

To lex these we need a moded lexer which is currently difficult to dogfood, for dogfooding we'd either need some form of actionless moded lexer .l file format capable of this context sensitivity, or find a way to compile and execute actions or manually implemented lexers, e.g. by compiling them to wasm.

The alternate option here is to just use crimson, and either:

• hack the grammar in a way which isn't correct and wouldn't allow nested quotes within strings, but would still be usable with nimbleparse_lsp.
• just not be able to use crimson from nimbleparse_lsp because it depends on a lexer not representable with nimbleparse_lsp's limitations.

In the short term, the last option is most palatable. But you couldn't use the combination of crimson + nimbleparse_lsp until this is fixed.