tree-sitter(haskell): use quasiquoters as an injection point (#6474)

Similar to tagged templates in JS, quasiquoters allow to embed external
languages in haskell, so it makes sense to treat them as an injection
point.

runtime/queries/haskell/injections.scm

@@ -1,2 +1,6 @@
 ((comment) @injection.content
  (#set! injection.language "comment"))
+
+(quasiquote
+ (quoter) @injection.language
+ (quasiquote_body) @injection.content)