Support tasks from rust-analyzer (#28359)

(and any other LSP server in theory, if it exposes any LSP-ext endpoint
for the same)

Closes https://github.com/zed-industries/zed/issues/16160

* adds a way to disable tree-sitter tasks (the ones from the plugins,
enabled by default) with
```json5
"languages": {
  "Rust": "tasks": {
      "enabled": false
    }
  }
}
```
language settings

* adds a way to disable LSP tasks (the ones from the rust-analyzer
language server, enabled by default) with
```json5
"lsp": {
  "rust-analyzer": {
    "enable_lsp_tasks": false,
  }
}
```

* adds rust-analyzer tasks into tasks modal and gutter:

<img width="1728" alt="modal"
src="https://github.com/user-attachments/assets/22b9cee1-4ffb-4c9e-b1f1-d01e80e72508"
/>

<img width="396" alt="gutter"
src="https://github.com/user-attachments/assets/bd818079-e247-4332-bdb5-1b7cb1cce768"
/>


Release Notes:

- Added tasks from rust-analyzer

crates/proto/proto/lsp.proto

@@ -699,3 +699,18 @@ message LanguageServerIdForName {
 message LanguageServerIdForNameResponse {
     optional uint64 server_id = 1;
 }
+
+message LspExtRunnables {
+    uint64 project_id = 1;
+    uint64 buffer_id = 2;
+    optional Anchor position = 3;
+}
+
+message LspExtRunnablesResponse {
+    repeated LspRunnable runnables = 1;
+}
+
+message LspRunnable {
+    bytes task_template = 1;
+    optional LocationLink location = 2;
+}

crates/proto/proto/zed.proto

@@ -372,12 +372,15 @@ message Envelope {
         GetDocumentSymbolsResponse get_document_symbols_response = 331;
 
         LanguageServerIdForName language_server_id_for_name = 332;
-        LanguageServerIdForNameResponse language_server_id_for_name_response = 333; // current max
+        LanguageServerIdForNameResponse language_server_id_for_name_response = 333;
 
         LoadCommitDiff load_commit_diff = 334;
         LoadCommitDiffResponse load_commit_diff_response = 335;
 
-        StopLanguageServers stop_language_servers = 336; // current max
+        StopLanguageServers stop_language_servers = 336;
+
+        LspExtRunnables lsp_ext_runnables = 337;
+        LspExtRunnablesResponse lsp_ext_runnables_response = 338; // current max
     }
 
     reserved 87 to 88;

crates/proto/src/proto.rs

@@ -171,6 +171,8 @@ messages!(
     (LspExtExpandMacroResponse, Background),
     (LspExtOpenDocs, Background),
     (LspExtOpenDocsResponse, Background),
+    (LspExtRunnables, Background),
+    (LspExtRunnablesResponse, Background),
     (LspExtSwitchSourceHeader, Background),
     (LspExtSwitchSourceHeaderResponse, Background),
     (MarkNotificationRead, Foreground),
@@ -414,6 +416,7 @@ request_messages!(
     (LanguageServerIdForName, LanguageServerIdForNameResponse),
     (LspExtExpandMacro, LspExtExpandMacroResponse),
     (LspExtOpenDocs, LspExtOpenDocsResponse),
+    (LspExtRunnables, LspExtRunnablesResponse),
     (SetRoomParticipantRole, Ack),
     (BlameBuffer, BlameBufferResponse),
     (RejoinRemoteProjects, RejoinRemoteProjectsResponse),
@@ -537,6 +540,7 @@ entity_messages!(
     UpdateWorktreeSettings,
     LspExtExpandMacro,
     LspExtOpenDocs,
+    LspExtRunnables,
     AdvertiseContexts,
     OpenContext,
     CreateContext,