Add telemetry to protocol specification

[cryptocode]

https://github.com/nanocurrency/nano-node/pull/2446

[wezrule]

telemetry_req No payload

telemetry_ack header.extensions contains the size of the telemetry data payload.

64 block_count
64 cemented_count
64 unchecked_count
64 account_count
64 bandwidth_cap
64 uptime
32 peer_count
8 protocol_version
256 genesis_block
8 major_version
8 minor_version
8 patch_version
8 pre_release_version
8 maker
64 timestamp

[inkeliz]

I think it should specify the type, not jus the size.

For comparation:

https://github.com/nanocurrency/protocol/blob/047eb69555d758aa870df4bc00848ab3be98378b/reference/protocol.ksy#L288-L296

https://github.com/nanocurrency/protocol/blob/047eb69555d758aa870df4bc00848ab3be98378b/reference/protocol.ksy#L352-L380

I think blockcount, for instance, is an uint64le, but it's not specified. I think it should be like the vote_common, with type: u8le.

[wezrule]

@Inkeliz

Makes sense, thanks. https://github.com/nanocurrency/protocol/pull/12/files. In case it affects any testing, we have also modified the data so be consistent, it is all big endian now.

[zhyatt]

Fixed in #12