Extract Protocol Buffers support into an extension (#18704)

This PR extracts the Protocol Buffers support into an extension.

Release Notes:

- Removed built-in support for Protocol Buffers, in favor of making it
available as an extension. The Protocol Buffers extension will be
suggested for download when you open a `.proto` file.

crates/languages/src/lib.rs

@@ -45,7 +45,6 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: NodeRuntime, cx: &mu
         ("jsonc", tree_sitter_json::LANGUAGE),
         ("markdown", tree_sitter_md::LANGUAGE),
         ("markdown-inline", tree_sitter_md::INLINE_LANGUAGE),
-        ("proto", protols_tree_sitter_proto::LANGUAGE),
         ("python", tree_sitter_python::LANGUAGE),
         ("regex", tree_sitter_regex::LANGUAGE),
         ("rust", tree_sitter_rust::LANGUAGE),
@@ -183,7 +182,6 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: NodeRuntime, cx: &mu
         "yaml",
         vec![Arc::new(yaml::YamlLspAdapter::new(node_runtime.clone()))]
     );
-    language!("proto");
 
     // Register globally available language servers.
     //
@@ -277,7 +275,7 @@ pub fn language(name: &str, grammar: tree_sitter::Language) -> Arc<Language> {
 fn load_config(name: &str) -> LanguageConfig {
     let config_toml = String::from_utf8(
         LanguageDir::get(&format!("{}/config.toml", name))
-            .unwrap()
+            .unwrap_or_else(|| panic!("missing config for language {:?}", name))
             .data
             .to_vec(),
     )

crates/languages/src/proto/config.toml

@@ -1,13 +0,0 @@
-name = "Proto"
-grammar = "proto"
-path_suffixes = ["proto"]
-line_comments = ["// "]
-autoclose_before = ";:.,=}])>"
-brackets = [
-    { start = "{", end = "}", close = true, newline = true },
-    { start = "[", end = "]", close = true, newline = true },
-    { start = "(", end = ")", close = true, newline = true },
-    { start = "\"", end = "\"", close = true, newline = false, not_in = ["comment", "string"] },
-    { start = "'", end = "'", close = true, newline = false, not_in = ["comment", "string"] },
-    { start = "/*", end = " */", close = true, newline = false, not_in = ["comment", "string"] },
-]

crates/languages/src/proto/highlights.scm

@@ -1,61 +0,0 @@
-[
-  "syntax"
-  "package"
-  "option"
-  "optional"
-  "import"
-  "service"
-  "rpc"
-  "returns"
-  "message"
-  "enum"
-  "oneof"
-  "repeated"
-  "reserved"
-  "to"
-] @keyword
-
-[
-  (key_type)
-  (type)
-  (message_name)
-  (enum_name)
-  (service_name)
-  (rpc_name)
-  (message_or_enum_type)
-] @type
-
-(enum_field
-  (identifier) @constant)
-
-[
-  (string)
-  "\"proto3\""
-] @string
-
-(int_lit) @number
-
-[
-  (true)
-  (false)
-] @boolean
-
-(comment) @comment
-
-[
-  "("
-  ")"
-  "["
-  "]"
-  "{"
-  "}"
-  "<"
-  ">"
-]  @punctuation.bracket
-
-[
- ";"
- ","
-] @punctuation.delimiter
-
-"=" @operator

crates/languages/src/proto/outline.scm

@@ -1,19 +0,0 @@
-(message
-    "message" @context
-    (message_name
-        (identifier) @name)) @item
-
-(service
-    "service" @context
-    (service_name
-        (identifier) @name)) @item
-
-(rpc
-    "rpc" @context
-    (rpc_name
-        (identifier) @name)) @item
-
-(enum
-    "enum" @context
-    (enum_name
-        (identifier) @name)) @item