feat:Input add getSelection API

doric-js/bundle/doric-lib.es5.js

@@ -2791,6 +2791,9 @@ var Input = /** @class */ (function (_super) {
             end: end,
         });
     };
+    Input.prototype.getSelection = function (context) {
+        return this.nativeChannel(context, 'getSelection')();
+    };
     Input.prototype.requestFocus = function (context) {
         return this.nativeChannel(context, 'requestFocus')();
     };

doric-js/bundle/doric-lib.js

@@ -2154,6 +2154,9 @@ class Input extends View {
             end,
         });
     }
+    getSelection(context) {
+        return this.nativeChannel(context, 'getSelection')();
+    }
     requestFocus(context) {
         return this.nativeChannel(context, 'requestFocus')();
     }

doric-js/bundle/doric-vm.js

@@ -3675,6 +3675,9 @@ class Input extends View {
             end,
         });
     }
+    getSelection(context) {
+        return this.nativeChannel(context, 'getSelection')();
+    }
     requestFocus(context) {
         return this.nativeChannel(context, 'requestFocus')();
     }