Implement syncBlocks function of LegacyChainHandler

[ishantiw]

Description

Implement syncBlocks function of LegacyChainHandler

1. Get a list of connectedPeers from the network
2. Find peers with legacy info corresponding to snapshotBlockID (if it contains legacy property with the snapshotBlockID as requested then it means it has the legacy blocks history)
3. If no peer is found then throw PeerNotFound error
4. Randomly select a peer from the filtered peers list (something like Math.trunc(Math.random() * filteredPeers.length - 1))
5. Request the peer with getLegacyBlocksFromId RPC and receive response with request param { id: Buffer }
   4.1. if response is invalid or validateLegacyBlock(blockBytes, nextBlock) fails then ban the peer with 100 penalty by calling network.applyPenalty(peerID, banScore)
6. Save the blocks and repeat step 1 to 4 until we reach startHeight defined in the config.
7. Once we reach the startHeight of a bracket we save the bracketInfo and return setLegacyChainBracketInfo(bracketInfo)

Acceptance Criteria

• Should have all the cases covered with the unit tests

Addtional Information

• Depends on Add validation logic for blocks and transaction root #7504
• Depends on Add legacy property on nodeInfo to be shared to peers #7498
• Define PeerNotFound error with argument as message
• Relates to Implement sync method on LegacyChainHandler #7547

[sitetester]

Depends on #7498