[feat] add TTL for grandpa historical votes and update storage spaces #2467
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Referenced issues
Closes #2468
Description of the Change
We have noticed that historical votes contribute the most to the grow of the database.
The problem was that KAGOME didn't have pruning mechanism for historical votes.
To solve that problem this PR:
Note, that in reality historical votes won't be cleared every two minutes, but rather their database entries will be marked as expired. The real removal of expired historical votes database entries will happen during database compaction, which happens automatically once in a while
Possible Drawbacks
None
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