New port: devel/libserdes: schema-based serializer/deserializer C/C++ library

With support for Avro and the Confluent Platform Schema Registry.
The library is aimed to be used in the streaming pipeline, e.g.
Apache Kafka, to perform data serialization and deserialization
with centrally managed schemas.

https://github.com/confluentinc/libserdes

PR: 254099
Submitted by: Sergey Akhmatov <sergey@akhmatov.ru> (maintainer)