Rename extension crate to extension_host (#20081)

This PR renames the `extension` crate to `extension_host`.

This is to free up the name so that we can create a smaller-scoped
`extension` crate.

Release Notes:

- N/A

crates/extensions_ui/Cargo.toml

@@ -20,7 +20,7 @@ client.workspace = true
 collections.workspace = true
 db.workspace = true
 editor.workspace = true
-extension.workspace = true
+extension_host.workspace = true
 fs.workspace = true
 fuzzy.workspace = true
 gpui.workspace = true

crates/extensions_ui/src/extension_suggest.rs

@@ -4,7 +4,7 @@ use std::sync::{Arc, OnceLock};
 
 use db::kvp::KEY_VALUE_STORE;
 use editor::Editor;
-use extension::ExtensionStore;
+use extension_host::ExtensionStore;
 use gpui::{Model, VisualContext};
 use language::Buffer;
 use ui::{SharedString, ViewContext};

crates/extensions_ui/src/extension_version_selector.rs

@@ -2,7 +2,7 @@ use std::str::FromStr;
 use std::sync::Arc;
 
 use client::ExtensionMetadata;
-use extension::{ExtensionSettings, ExtensionStore};
+use extension_host::{ExtensionSettings, ExtensionStore};
 use fs::Fs;
 use fuzzy::{match_strings, StringMatch, StringMatchCandidate};
 use gpui::{
@@ -167,7 +167,7 @@ impl PickerDelegate for ExtensionVersionSelectorDelegate {
         let candidate_id = self.matches[self.selected_index].candidate_id;
         let extension_version = &self.extension_versions[candidate_id];
 
-        if !extension::is_version_compatible(ReleaseChannel::global(cx), extension_version) {
+        if !extension_host::is_version_compatible(ReleaseChannel::global(cx), extension_version) {
             return;
         }
 
@@ -203,7 +203,7 @@ impl PickerDelegate for ExtensionVersionSelectorDelegate {
         let extension_version = &self.extension_versions[version_match.candidate_id];
 
         let is_version_compatible =
-            extension::is_version_compatible(ReleaseChannel::global(cx), extension_version);
+            extension_host::is_version_compatible(ReleaseChannel::global(cx), extension_version);
         let disabled = !is_version_compatible;
 
         Some(

crates/extensions_ui/src/extensions_ui.rs

@@ -11,7 +11,7 @@ use client::telemetry::Telemetry;
 use client::ExtensionMetadata;
 use collections::{BTreeMap, BTreeSet};
 use editor::{Editor, EditorElement, EditorStyle};
-use extension::{ExtensionManifest, ExtensionOperation, ExtensionStore};
+use extension_host::{ExtensionManifest, ExtensionOperation, ExtensionStore};
 use fuzzy::{match_strings, StringMatchCandidate};
 use gpui::{
     actions, uniform_list, AppContext, EventEmitter, Flatten, FocusableView, InteractiveElement,
@@ -203,8 +203,8 @@ impl ExtensionsPage {
             let subscriptions = [
                 cx.observe(&store, |_, _, cx| cx.notify()),
                 cx.subscribe(&store, move |this, _, event, cx| match event {
-                    extension::Event::ExtensionsUpdated => this.fetch_extensions_debounced(cx),
-                    extension::Event::ExtensionInstalled(extension_id) => {
+                    extension_host::Event::ExtensionsUpdated => this.fetch_extensions_debounced(cx),
+                    extension_host::Event::ExtensionInstalled(extension_id) => {
                         this.on_extension_installed(workspace_handle.clone(), extension_id, cx)
                     }
                     _ => {}
@@ -691,7 +691,8 @@ impl ExtensionsPage {
         has_dev_extension: bool,
         cx: &mut ViewContext<Self>,
     ) -> (Button, Option<Button>) {
-        let is_compatible = extension::is_version_compatible(ReleaseChannel::global(cx), extension);
+        let is_compatible =
+            extension_host::is_version_compatible(ReleaseChannel::global(cx), extension);
 
         if has_dev_extension {
             // If we have a dev extension for the given extension, just treat it as uninstalled.