Change the id of messages in protocol

[AurelienFT]

Context

Currently, in the network we are using a single ID for each message but this ID has two roles: to determine which handler should manage this and what is the message type within this handler.

Problem

Adding a new message in an handler at the middle of the others will change the id of the messages of the others handlers also.

Solution

Use two varint u64 as version one for handler, the other for the inner type.

[AurelienFT]

Fix in #3979