[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/tui/src/app.rs

@@ -2422,6 +2422,9 @@ impl App {
                         url,
                         is_installed,
                         is_enabled,
+                        suggest_reason: None,
+                        suggestion_type: None,
+                        elicitation_target: None,
                     });
             }
             AppEvent::OpenUrlInBrowser { url } => {