JsonFormat compatibility for unconventionally named properties

[gowa]

With ProtobufJacksonConfig.useCanonicalSerialization the output produced by jackson-datatype-protobuf is not compatible with JsonFormat.

message UnconventionalProto3 {
  string camelCase = 1;
  string weird_UpperCamelCase = 2;
  string weird_lowerCamelCase = 3;
  string weird_1lowerCamelCase = 4;
  string weird_2UpperCamelCase = 5;
  string weird_3_lowerCamelCase = 6;
  string weird_4_UpperCamelCase = 7;
}

E.g., JsonFormat would have produced:
"camelCase":"value"
while jackson-datatype-protobuf produces:
"camelcase":"value"

It's suggested to use another PropertyNamingStrategy with useCanonicalSerialization.