[UDF] - protobuf files should be migrated to start with newer `edition` number

[karel-rehor]

Currently the UDF file udf/agent/udf.proto starts with the declaration syntax = "proto3";. A newer preferable syntax exists for protobuf editions.

e.g.

edition = "2023";

see: https://protobuf.dev/editions/overview/

While working on cleaning up dependabot issues, golang upgrades and deprecating Python2 support, perhaps this should be migrated as well.

Perhaps once Python2 support has ended, this can be migrated.