Add benchmark for name translation

[pglass]

What was changed

Add a benchmark test for the reflection-based name translation

Why?

Checklist

1. Closes

2. How was this tested:

• make bench - (also runs another benchmark)
• BENCH_ARG="-bench '^BenchmarkVisitNamespace' -benchtime=5000x" make bench - just run the new bench function

BenchmarkVisitNamespace/Namespace_field/name_changed-14                     5000               860.8 ns/op           240 B/op          6 allocs/op
BenchmarkVisitNamespace/Namespace_field/name_unchanged-14                   5000               720.1 ns/op           224 B/op          5 allocs/op
BenchmarkVisitNamespace/WorkflowNamespace_field/name_changed-14             5000               710.8 ns/op           240 B/op          6 allocs/op
BenchmarkVisitNamespace/WorkflowNamespace_field/name_unchanged-14                   5000               632.7 ns/op           224 B/op          5 allocs/op
BenchmarkVisitNamespace/Nested_Namespace_field/name_changed-14                      5000              1186 ns/op             512 B/op         11 allocs/op
BenchmarkVisitNamespace/Nested_Namespace_field/name_unchanged-14                    5000               972.0 ns/op           496 B/op         10 allocs/op
BenchmarkVisitNamespace/list_of_structs/name_changed-14                             5000              1359 ns/op             584 B/op         12 allocs/op
BenchmarkVisitNamespace/list_of_structs/name_unchanged-14                           5000              1176 ns/op             568 B/op         11 allocs/op
BenchmarkVisitNamespace/list_of_ptrs/name_changed-14                                5000              1398 ns/op             648 B/op         13 allocs/op
BenchmarkVisitNamespace/list_of_ptrs/name_unchanged-14                              5000              1230 ns/op             632 B/op         12 allocs/op
BenchmarkVisitNamespace/RespondWorkflowTaskCompletedRequest/name_changed-14                 5000              7772 ns/op           11048 B/op         74 allocs/op
BenchmarkVisitNamespace/RespondWorkflowTaskCompletedRequest/name_unchanged-14               5000              7656 ns/op           11000 B/op         71 allocs/op
BenchmarkVisitNamespace/PollWorkflowTaskQueueResponse/name_changed-14                       5000              5436 ns/op            5984 B/op         55 allocs/op
BenchmarkVisitNamespace/PollWorkflowTaskQueueResponse/name_unchanged-14                     5000              5183 ns/op            5968 B/op         54 allocs/op
BenchmarkVisitNamespace/GetWorkflowExecutionRawHistoryV2Response/name_changed-14            5000             22405 ns/op           39648 B/op        313 allocs/op
BenchmarkVisitNamespace/GetWorkflowExecutionRawHistoryV2Response/name_unchanged-14          5000             21075 ns/op           37992 B/op        284 allocs/op
BenchmarkVisitNamespace/DescribeNamespaceResponse/name_changed-14                           5000              2641 ns/op            2656 B/op         22 allocs/op
BenchmarkVisitNamespace/DescribeNamespaceResponse/name_unchanged-14                         5000              2776 ns/op            2656 B/op         22 allocs/op
BenchmarkVisitNamespace/UpdateNamespaceResponse/name_changed-14                             5000              5229 ns/op            5704 B/op         45 allocs/op
BenchmarkVisitNamespace/UpdateNamespaceResponse/name_unchanged-14                           5000              5046 ns/op            5704 B/op         45 allocs/op
BenchmarkVisitNamespace/ListNamespacesResponse/name_changed-14                              5000              3345 ns/op            2976 B/op         30 allocs/op
BenchmarkVisitNamespace/ListNamespacesResponse/name_unchanged-14                            5000              3353 ns/op            2976 B/op         30 allocs/op
BenchmarkVisitNamespace/StreamWorkflowReplicationMessagesResponse/name_changed-14           5000            103102 ns/op          178443 B/op       1638 allocs/op
BenchmarkVisitNamespace/StreamWorkflowReplicationMessagesResponse/name_unchanged-14         5000             99668 ns/op          170203 B/op       1494 allocs/op
BenchmarkVisitNamespace/circular_pointer/name_changed-14                                    5000              1273 ns/op             592 B/op         13 allocs/op
BenchmarkVisitNamespace/circular_pointer/name_unchanged-14                                  5000              1101 ns/op             560 B/op         11 allocs/op

3. Any docs updates needed?

[hehaifengcn]

what are the results?