Add built-in plugin for getting LDAP attributes (#7317)

app/plugin/ldapextras/configuration.go

@@ -0,0 +1,9 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package ldapextras
+
+type Configuration struct {
+	Enabled    bool
+	Attributes []string
+}