Get the block IDs of all blocks forged (generated) by an account in reverse block height order.
Request:requestType is getAccountBlockIdsaccount is the account ID
timestamp is the earliest block (in seconds since the genesis block) to retrieve (optional)
firstIndex is the zero-based index to the first block to retrieve (optional)
lastIndex is the zero-based index to the last block to retrieve (optional)
Response:
(A) blockIds is the array of blocks
(N) requestProcessingTime is the API request processing time (in millsec)