Extract lua language support into an extension (#10437)

Release Notes:

- Extracted lua language support into an extension, and improved Lua
highlighting and completion label styling.

---------

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

Cargo.lock

@@ -5438,7 +5438,6 @@ dependencies = [
  "tree-sitter-heex",
  "tree-sitter-jsdoc",
  "tree-sitter-json 0.20.0",
- "tree-sitter-lua",
  "tree-sitter-markdown",
  "tree-sitter-nix",
  "tree-sitter-nu",
@@ -10435,16 +10434,6 @@ dependencies = [
  "tree-sitter",
 ]
 
-[[package]]
-name = "tree-sitter-lua"
-version = "0.0.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d489873fd1a2fa6d5f04930bfc5c081c96f0c038c1437104518b5b842c69b282"
-dependencies = [
- "cc",
- "tree-sitter",
-]
-
 [[package]]
 name = "tree-sitter-markdown"
 version = "0.0.1"
@@ -12648,6 +12637,13 @@ dependencies = [
  "zed_extension_api 0.0.4",
 ]
 
+[[package]]
+name = "zed_lua"
+version = "0.0.1"
+dependencies = [
+ "zed_extension_api 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "zed_php"
 version = "0.0.1"