refactor: replica listing based on query

Signed-off-by: Abhinandan Purkait <[email protected]>

protobuf/v1/replica.proto

@@ -90,9 +90,10 @@ message ListReplicaOptions {
   google.protobuf.StringValue pooluuid = 4; // list the replicas on the provided pool, by uuid
   Query query = 5; // list replica based on Query value
 
-  /// Query used for getting specific types of replicas.
+  /// Query used for getting specific types of replicas. These are mutually exclusive, ex. a snapshot cannot be clone.
   message Query {
-    optional bool snapshot = 1; // query for selecting or snapshot types.
-    optional bool clone = 2; // query for selecting or clone types.
+    bool replica = 1; // query for selecting or normal replica types.
+    bool snapshot = 2; // query for selecting or snapshot types.
+    bool clone = 3; // query for selecting or clone types.
   }
 }