decouple raftLog - phase 1: introduce the new type controlflowLog. #292
+13
−6
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#142 - this is about to decouple the type raftLog.
since this change may include a lot of cascaded code changes on several types, i'd like to split this refactor into two phase.
phase 1: introduce the type controlflowLog. add it back into raftLog as embedding type.
i move all control flow related fields into type controlflowLog.
phase 2: remove the embedding type. modify type reference in all other files.
in this PR, i implemented phase 1. please review it.