feat: support MetaMask provider (#2084)

* feat: add metamask provider

* feat: add eth login

* feat: check eth sign

* feat: finish metamask signin/signup

* feat: support MetaMask provider link/unlink

* feat: update web/craco.config.js to handle polyfill

* feat: gofumpt idp/metamask.go

* feat: update MetaMask logo path

* feat: support MetaMask avatar

web/src/account/AccountAvatar.js

@@ -0,0 +1,36 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import React from "react";
+import {MetaMaskAvatar} from "react-metamask-avatar";
+
+class AccountAvatar extends React.Component {
+  render() {
+    const {src, size} = this.props;
+    // The avatar for Metamask account is directly generated by an algorithm based on the address
+    // src = "metamask:0xC304b2cC0Be8E9ce10fF3Afd34820Ed306A23600";
+    const matchMetaMask = src.match(/^metamask:(\w+)$/);
+    if (matchMetaMask) {
+      const address = matchMetaMask[1];
+      return (
+        <MetaMaskAvatar address={address} size={size} />
+      );
+    }
+    return (
+      <img width={size} height={size} src={src} />
+    );
+  }
+}
+
+export default AccountAvatar;