fix(state): use rw lock to prevent inconsitent state view #4867
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Description
While restarting iroha i've noticed that snapshot is inconsistent.
After some investigation i've noticed that assumption i had about the State was wrong (check this issue).
This PR fix this inconsistency by introducing lock which is used to guard block commit and prevent creation of inconsistent views of the State.
Benefits
Views are consistent.
Downsides
Rwlock has problems with writer starvation.