* Invalid Argument errors now return a per field error message.
* Creating an API error struct.
* SDK uses field error details proto.
* Adding tests specifically for handler helper error messages resulting in expected API output.
* Inlining the error checks into the table driven tests. Use protocmp for assertions to make printing out diffs easier to parse.
* Aggregate the invalid argument fields detected to be wrong.
* Make the returned order of fields deterministic in the error details..
* Fixing formatting issue in errors_test.go.
* Test to confirm unimplemented results in a 405 and not 404.
Jeff Mitchell
Todd Knight