feat(cli): support Ctrl-Z suspension (#18931)

Co-authored-by: Bharat Kunwar <brtkwr@gmail.com>

packages/cli/src/ui/keyMatchers.test.ts

@@ -330,6 +330,18 @@ describe('keyMatchers', () => {
       positive: [createKey('d', { ctrl: true })],
       negative: [createKey('d'), createKey('c', { ctrl: true })],
     },
+    {
+      command: Command.SUSPEND_APP,
+      positive: [
+        createKey('z', { ctrl: true }),
+        createKey('z', { ctrl: true, shift: true }),
+      ],
+      negative: [
+        createKey('z'),
+        createKey('y', { ctrl: true }),
+        createKey('z', { alt: true }),
+      ],
+    },
     {
       command: Command.SHOW_MORE_LINES,
       positive: [