Protocol: do not use unlimited history option by default

[FZambia]

Currently when clients call channel history they receive all Publications kept in stream. Since we now have a pagination it's likely that streams may be a bigger size than before.

The plan is to make history act with limit == 0 by default. I.e. receive current stream position only (offset + epoch) without publications. While this is a breaking change in a client protocol we can always modify behaviour of history on server side calling node.History inside OnHistory handler.

[FZambia]

Done in 98f6388, will be part of v0.18.0