[ETCM-969] move best block and genesis functions to blockchain reader #1036
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Description
Sorry for the long PR. This PR is a prerequisite for ETCM-969. It moves some part of blockchain to the BlockchainReader and I will open a second PR will use that to create a "blockchain instance" interface.
The changes are :
getBestBlock
andgetBestBlockNumber
toBlockchainReader
BlockchainReader
It also has a common part with #1035 regarding blockchain metadata. I kept the same naming so that the conflict are easy to fix if any.