feat(SubmitKey): add MetaEnter option

Add another option for MacOS user who prefer Cmd+Enter
or Linux user who prefer Meta+Enter.

app/components/home.tsx

@@ -131,6 +131,7 @@ function useSubmitHandler() {
       (config.submitKey === SubmitKey.AltEnter && e.altKey) ||
       (config.submitKey === SubmitKey.CtrlEnter && e.ctrlKey) ||
       (config.submitKey === SubmitKey.ShiftEnter && e.shiftKey) ||
+      (config.submitKey === SubmitKey.MetaEnter && e.metaKey) ||
       (config.submitKey === SubmitKey.Enter &&
         !e.altKey &&
         !e.ctrlKey &&

app/store/app.ts

@@ -21,6 +21,7 @@ export enum SubmitKey {
   CtrlEnter = "Ctrl + Enter",
   ShiftEnter = "Shift + Enter",
   AltEnter = "Alt + Enter",
+  MetaEnter = "Meta + Enter",
 }
 
 export enum Theme {