go: our own errors get sent out over grpc with blank message

[pro-wh]

SUMMARY

errors.Code seems to swallow the message when there's no context. when using a client other than our Go codebase, there's no facility to look up the module and code to get the message. in some cases such as through grpc-web, missing library support makes it impossible to get the module and code in the first place, and all you have is the message.

ISSUE TYPE

• Bug Report

COMPONENT NAME

go/common/errors

OASIS NODE VERSION

21.3

OS / ENVIRONMENT

n/a

STEPS TO REPRODUCE

Trigger an error such as submitting a staking.Allow transaction when allowances are disabled (max allowances = 0).

ACTUAL RESULTS

GRPC error message blank

EXPECTED RESULTS

GRPC error message staking: forbidden by policy

[pro-wh]

maybe better to fix this in common/grpc, judging by the name. errors.Code can continue to give context only