[DISCUSS] PIP-246: Improved PROTOBUF_NATIVE schema compatibility checks without using avro-protobuf

[SiNan Liu]

Hi all,

I made a PIP to discuss: https://github.com/apache/pulsar/issues/19565.

We can talk about the current design here. Especially for the field type
change check rules, please give your valuable advice.

Thanks,
Sinan