Refactor consensus output to write to an intermediate store before going to the db

[mystenmark]

This PR should have no behavior changes. It introduces a new struct, ConsensusCommitOutput, which stores all writes generated while processing a consensus commit, prior to writing them to the db.

This is the first stage of caching/quarantining consensus-specific epoch-db state. The next step will be to hold ConsensusCommitOutput structs in memory until the checkpoints created for the commit have been certified. This will also require reading from ConsensusCommitOutput (or more likely, a broader caching struct which holds information from a set of ConsensusCommitOutput objects), since required information will not always be available from the db.

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