feat:🎁 tree-sitter injections

[molostovvs]

Hi, I want to write tree-sitter language injections to work with sql, json and xml strings that are in a .cs file. Like for example in this plugin https://github.com/ray-x/go.nvim/tree/master/after/queries/go.

What do you think about including them in your plugin? I'm planning to make an analog of language injections like in Rider https://www.jetbrains.com/help/rider/Language_Injections.html#use-comments so that this sql string will be correctly highlighted:

//language=sql
var someQuery = "select * from user where id = 0";

with fallback options that will work based on regexp.

Implementation

test c# project with some strings: https://github.com/molostovvs/TreeSitterCsharpInjectionsTestProject

todo:

strings

string	sql	json	xml
quoted	✅	❌	❌
verbatim	✅	❌	❌
raw	✅	✅	✅
regexp quoted	❌	❌	❌
regexp verbatim	❌	❌	❌
regexp raw	❌	❌	❌

interpolated strings

interpolated string	json	xml
quoted	❌	❌
verbatim	❌	❌
raw	❌	❌
regexp quoted	❌	❌
regexp verbatim	❌	❌
regexp raw	❌	❌