[MM-61756] Attribute Based Access Control - Phase 1 (#30785)

Attribute Based Access Control - Base
* MM-63662

* MM-63919

* MM-63954

* MM-63955 

* MM-63425

* MM-63426

* MM-63458

* MM-63459

* MM-63603

* MM-63845

* MM-64146

* MM-64199

* MM-64201

* MM-64233

* MM-64247

* MM-64268

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Co-authored-by: Harshil Sharma <harshilsharma63@gmail.com>
Co-authored-by: Pablo Andrés Vélez Vidal <pablovv2012@gmail.com>
Co-authored-by: abhijit-singh <abhijitsingh0702@gmail.com>
Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

server/einterfaces/access_control.go

@@ -0,0 +1,12 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package einterfaces
+
+// AccessControlServiceInterface is the interface that provides access control
+// services. It combines the PolicyAdministrationPointInterface and
+// PolicyDecisionPointInterface interfaces to provide a complete access control solution.
+type AccessControlServiceInterface interface {
+	PolicyAdministrationPointInterface
+	PolicyDecisionPointInterface
+}