Extract Scheme and Racket language support into extensions (#10442)

Release Notes:

- Extracted Scheme and Racket language support into extensions.

---------

Co-authored-by: Marshall <marshall@zed.dev>

Cargo.lock

@@ -5443,11 +5443,9 @@ dependencies = [
  "tree-sitter-ocaml",
  "tree-sitter-proto",
  "tree-sitter-python",
- "tree-sitter-racket",
  "tree-sitter-regex",
  "tree-sitter-ruby",
  "tree-sitter-rust",
- "tree-sitter-scheme",
  "tree-sitter-typescript",
  "tree-sitter-vue",
  "tree-sitter-yaml",
@@ -10468,15 +10466,6 @@ dependencies = [
  "tree-sitter",
 ]
 
-[[package]]
-name = "tree-sitter-racket"
-version = "0.0.1"
-source = "git+https://github.com/zed-industries/tree-sitter-racket?rev=eb010cf2c674c6fd9a6316a84e28ef90190fe51a#eb010cf2c674c6fd9a6316a84e28ef90190fe51a"
-dependencies = [
- "cc",
- "tree-sitter",
-]
-
 [[package]]
 name = "tree-sitter-regex"
 version = "0.20.0"
@@ -10507,15 +10496,6 @@ dependencies = [
  "tree-sitter",
 ]
 
-[[package]]
-name = "tree-sitter-scheme"
-version = "0.2.0"
-source = "git+https://github.com/6cdh/tree-sitter-scheme?rev=af0fd1fa452cb2562dc7b5c8a8c55551c39273b9#af0fd1fa452cb2562dc7b5c8a8c55551c39273b9"
-dependencies = [
- "cc",
- "tree-sitter",
-]
-
 [[package]]
 name = "tree-sitter-typescript"
 version = "0.20.2"