Convert attempts to int32 for consistency (#85)

Author: alexshtin

temporal/api/history/v1/message.proto

@@ -118,7 +118,7 @@ message WorkflowTaskScheduledEventAttributes {
     // (-- api-linter: core::0140::prepositions=disabled
     //     aip.dev/not-precedent: "to" is used to indicate interval. --)
     google.protobuf.Duration start_to_close_timeout = 2 [(gogoproto.stdduration) = true];
-    int64 attempt = 3;
+    int32 attempt = 3;
 }
 
 message WorkflowTaskStartedEventAttributes {

temporal/api/workflowservice/v1/request_response.proto

@@ -186,7 +186,7 @@ message PollWorkflowTaskQueueResponse {
     temporal.api.common.v1.WorkflowType workflow_type = 3;
     int64 previous_started_event_id = 4;
     int64 started_event_id = 5;
-    int64 attempt = 6;
+    int32 attempt = 6;
     int64 backlog_count_hint = 7;
     temporal.api.history.v1.History history = 8;
     bytes next_page_token = 9;