js: implement keyboard related api

doric-js/bundle/doric-lib.js

@@ -2643,6 +2643,18 @@ function notch(context) {
     };
 }
 
+function keyboard(context) {
+    return {
+        subscribe: (callback) => {
+            return context.callNative('keyboard', 'subscribe', context.function2Id(callback));
+        },
+        unsubscribe: (subscribeId) => {
+            context.removeFuncById(subscribeId);
+            return context.callNative('keyboard', 'unsubscribe', subscribeId);
+        }
+    };
+}
+
 class Observable {
     constructor(provider, clz) {
         this.observers = new Set;
@@ -2789,6 +2801,7 @@ exports.hlayout = hlayout;
 exports.image = image;
 exports.input = input;
 exports.internalScheme = internalScheme;
+exports.keyboard = keyboard;
 exports.layoutConfig = layoutConfig;
 exports.list = list;
 exports.listItem = listItem;