[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/pdp.go

@@ -12,5 +12,5 @@ import (
 // using the OpenID Auth API spec. It determines whether a subject can perform
 // an action on a resource based on the resource policy.
 type PolicyDecisionPointInterface interface {
-	AccessEvaluation(rctx request.CTX, accessRequest model.AccessRequest) (*model.AccessDecision, *model.AppError)
+	AccessEvaluation(rctx request.CTX, accessRequest model.AccessRequest) (model.AccessDecision, *model.AppError)
 }