Extract Terraform extension (#10479)

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

Release Notes:

- Removed built-in support for Terraform, in favor of making it
available as
an extension. The Terraform extension will be suggested for download
when you
open a `.tf`, `.tfvars`, or `.hcl` file.

crates/extension/src/extension_lsp_adapter.rs

@@ -10,7 +10,7 @@ use gpui::AsyncAppContext;
 use language::{
     CodeLabel, HighlightId, Language, LanguageServerName, LspAdapter, LspAdapterDelegate,
 };
-use lsp::LanguageServerBinary;
+use lsp::{CodeActionKind, LanguageServerBinary};
 use serde::Serialize;
 use serde_json::Value;
 use std::ops::Range;
@@ -129,6 +129,24 @@ impl LspAdapter for ExtensionLspAdapter {
         None
     }
 
+    fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
+        if self.extension.manifest.id.as_ref() == "terraform" {
+            // This is taken from the original Terraform implementation, including
+            // the TODOs:
+            // TODO: file issue for server supported code actions
+            // TODO: reenable default actions / delete override
+            return Some(vec![]);
+        }
+
+        Some(vec![
+            CodeActionKind::EMPTY,
+            CodeActionKind::QUICKFIX,
+            CodeActionKind::REFACTOR,
+            CodeActionKind::REFACTOR_EXTRACT,
+            CodeActionKind::SOURCE,
+        ])
+    }
+
     fn language_ids(&self) -> HashMap<String, String> {
         // TODO: The language IDs can be provided via the language server options
         // in `extension.toml now but we're leaving these existing usages in place temporarily