initial dump, end-of-rib (EOR) as per rfc 7854

[umkhan123]

whenever I read data from Kafka, I only update messages but not the initial dump and EOR as per https://datatracker.ietf.org/doc/html/rfc7854#section-3.3.

All the initial data comes as separate messages with
{"action":"add"
.
which is same or any update so how we can differentiate between Initial dump and update

[sbezverk]

The idea was that it is responsibility of the information consumer to deal with add/update logic. gobmp is not tracking all bmp sessions from this perspective, as tracking bmp sessions would impact scalability.