* add string non-empty validation to AWS creds * clean up import spacing * syntax fixup * change to non-empty validation only * convert to lower snake_case - https://protobuf.dev/programming-guides/style/#message-field-names
* add string non-empty validation to AWS creds * clean up import spacing * syntax fixup * change to non-empty validation only * convert to lower snake_case - https://protobuf.dev/programming-guides/style/#message-field-names