1.4.0-rc.1

Features

Syncing Node #1648

Adds syncing node state for Iroha.

What is a syncing node?

Node in the state can:

• send transactions
• execute queries
• synchronize with remote nodes
• apply and validate blocks
• construct WSV

It can not:

• request proposals
• send votes(votes from such a node will be skipped)
• generate events of building block

RocksDB Metrics #1692

Healthcheck #1735

Added healthcheck interfaces via:

• http
• grpc
• metrics

Docs Fixes

Fixed broken links: build status, build guide, etc. #1318
Small Fixes on Configuration and Docker Metrics #1654