This commits serves as preparatory work for committing a pending batch
before providing signatures to the auctioneer. This is achieved by first
storing the batch as pending upon receiving a new batch and marking it
as complete upon receiving a finalize message.
This aims to satisfy the account.Store dependency required by the
account.Manager. We now extend our bolt database to store information
about any pending and confirmed accounts we've opened.
In this commit, we add a persistent store backed by bolt for the client
portion of CLM in which we'll store critical information required for
its proper operation.
