chore: [guardian] add support to fetch dynamic policy steps (#166)

* chore: [guardian] add support to fetch dynamic policy steps

* chore: review comments incorporated

---------

Co-authored-by: Anjali Aggarwal <[email protected]>

Author: anjali9791

gotocompany/guardian/v1beta1/guardian.proto

@@ -811,6 +811,7 @@ message ListGrantsRequest {
   string q = 15;
   repeated string group_ids = 16;
   repeated string group_types = 17;
+  bool with_approvals = 18;
 }
 
 message ListGrantsResponse {
@@ -997,7 +998,7 @@ message PolicyAppealConfig {
   }
   repeated Question questions = 5;
   bool allow_creator_details_failure = 6;
-  
+
   message MetadataSource {
     string name = 1;
     string description = 2;
@@ -1069,6 +1070,12 @@ message Policy {
   IAM iam = 9;
 
   PolicyAppealConfig appeal = 10;
+
+  message CustomSteps {
+    string type = 1;
+    google.protobuf.Value config = 2;
+  }
+  CustomSteps custom_steps =  11;
 }
 
 message AppealOptions {