refactor: rename ployfill to polyfill

Signed-off-by: MiaoWoo <admin@yumc.pw>

packages/polyfill/src/es5-ext.ts

@@ -0,0 +1,26 @@
+// ES2015 String ployfill must force overwrite to js method
+Object.defineProperty(String.prototype, 'contains', {
+    value: require(`es5-ext/string/#/contains/shim`),
+    configurable: true,
+    enumerable: false,
+    writable: true
+})
+Object.defineProperty(String.prototype, 'repeat', {
+    value: require(`es5-ext/string/#/repeat/shim`),
+    configurable: true,
+    enumerable: false,
+    writable: true
+})
+Object.defineProperty(String.prototype, 'startsWith', {
+    value: require(`es5-ext/string/#/starts-with/shim`),
+    configurable: true,
+    enumerable: false,
+    writable: true
+})
+Object.defineProperty(String.prototype, 'endsWith', {
+    value: require(`es5-ext/string/#/ends-with/shim`),
+    configurable: true,
+    enumerable: false,
+    writable: true
+})
+