[apps] Add tool_suggest tool. (#14287)

- [x] Add tool_suggest tool.
- [x] Move chatgpt/src/connectors.rs and core/src/connectors.rs into a
dedicated mod so that we have all the logic and global cache in one
place.
- [x] Update TUI app link view to support rendering the installation
view for mcp elicitation.

---------

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codex-rs/core/src/features.rs

@@ -142,6 +142,8 @@ pub enum Feature {
     SpawnCsv,
     /// Enable apps.
     Apps,
+    /// Enable discoverable tool suggestions for apps.
+    ToolSuggest,
     /// Enable plugins.
     Plugins,
     /// Allow the model to invoke the built-in image generation tool.
@@ -714,6 +716,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         },
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::ToolSuggest,
+        key: "tool_suggest",
+        stage: Stage::UnderDevelopment,
+        default_enabled: false,
+    },
     FeatureSpec {
         id: Feature::Plugins,
         key: "plugins",
@@ -996,6 +1004,12 @@ mod tests {
         assert_eq!(Feature::RequestPermissionsTool.default_enabled(), false);
     }
 
+    #[test]
+    fn tool_suggest_is_under_development() {
+        assert_eq!(Feature::ToolSuggest.stage(), Stage::UnderDevelopment);
+        assert_eq!(Feature::ToolSuggest.default_enabled(), false);
+    }
+
     #[test]
     fn image_generation_is_under_development() {
         assert_eq!(Feature::ImageGeneration.stage(), Stage::UnderDevelopment);