Patch/upgrade bsp

[noslav]

In order to run only against the most recent blocks aka live sync historical sync has to be avoided (Historical mode: 0, Live mode: 1..). Keeping this as a *uint32 to expand use cases in the future to other modes

1. Set up a thread to monitor at start of node, to check if the historical synchronization is complete
2. Atomically set the block replica config flag var for when the historical sync is finished using the handler interface Synced() fn
3. Read the atomically set value to determine if the most recent blocks should be exported accordingly in block_replica.go
4. Set the default values of replica config historical flag to 0 when starting a node so only the txs for recent blocks are sent (without overwhelming the proof-chain with txs that have been missed for earlier blocks)