add reason

Author: spkane31

temporal/api/batch/v1/message.proto

@@ -45,6 +45,9 @@ message BatchOperationTermination {
 message BatchOperationTerminateActivities {
   // The identity of the worker/client
   string identity = 1;
+  // Reason for requesting the termination, recorded and available via the PollActivityExecution API.
+  // Not propagated to a worker if an activity attempt is currently running.
+  string reason = 2;
 }
 
 // BatchOperationSignal sends signals to batch workflows.
@@ -74,6 +77,9 @@ message BatchOperationCancellation {
 message BatchOperationCancelActivities {
   // The identity of the worker/client
   string identity = 1;
+    // Reason for requesting the cancellation, recorded and available via the PollActivityExecution API.
+    // Not propagated to a worker if an activity attempt is currently running.
+    string reason = 2;
 }
 
 // BatchOperationDeletion sends deletion requests to batch workflows.