fix: LDAP groups handling and group mapping (#11855)

comprehensively handle group mapping for LDAP
users across IAM sub-subsytem.

pkg/bucket/policy/policy.go

@@ -27,6 +27,7 @@ const DefaultVersion = "2012-10-17"
 // Args - arguments to policy to check whether it is allowed
 type Args struct {
 	AccountName     string              `json:"account"`
+	Groups          []string            `json:"groups"`
 	Action          Action              `json:"action"`
 	BucketName      string              `json:"bucket"`
 	ConditionValues map[string][]string `json:"conditions"`