Provide C API

[rawhuul]

It would be wonderful to have C-API to syntect library similar to treesitter. This will open up a gate to lot more users to use this library.

[Enselic]

My preference would be do expose a C API of syntect in a third-party crate. Effectively a C facade in front of the Rust API that is maintained elsewhere.

(I will close this issue as "won't fix" at a later point unless other maintainers express a desire to maintain a C API of syntect.)

[rawhuul]

Okay, I will dig deep into the library and try to make a C wrapper of it in free time