Extract TOML support into an extension (#9940)

This PR extracts TOML support into an extension and removes the built-in
TOML support from Zed.

There's a small workaround necessary in order for us to set the file
permissions on the `taplo` binary so that it can be run. Eventually
we'll want to build this into the extension API, but for now we're just
hard-coding it on the host side.

Release Notes:

- Removed built-in support for TOML, in favor of making it available as
an extension. The TOML extension will be suggested for download when you
open a `.toml` or `Cargo.lock` file.

Cargo.lock

@@ -5462,7 +5462,6 @@ dependencies = [
  "tree-sitter-ruby",
  "tree-sitter-rust",
  "tree-sitter-scheme",
- "tree-sitter-toml",
  "tree-sitter-typescript",
  "tree-sitter-vue",
  "tree-sitter-yaml",
@@ -10651,15 +10650,6 @@ dependencies = [
  "tree-sitter",
 ]
 
-[[package]]
-name = "tree-sitter-toml"
-version = "0.5.1"
-source = "git+https://github.com/tree-sitter/tree-sitter-toml?rev=342d9be207c2dba869b9967124c679b5e6fd0ebe#342d9be207c2dba869b9967124c679b5e6fd0ebe"
-dependencies = [
- "cc",
- "tree-sitter",
-]
-
 [[package]]
 name = "tree-sitter-typescript"
 version = "0.20.2"
@@ -12725,6 +12715,13 @@ dependencies = [
  "zed_extension_api 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "zed_toml"
+version = "0.0.1"
+dependencies = [
+ "zed_extension_api 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "zed_uiua"
 version = "0.0.1"