Separate ledger db tables for nodes

[ercecan]

Right now all of our nodes have the same ledger db tables even if they never ever use them, so when implementing migration for a table name change for example for prover
VerifiedProofs -> VerifiedBatchProofs
We need to implement this migration for every node, which does not make any sense at all. Instead I propose all nodes have their own tables.
There can still be common tables of course, but other than that the node should have their tables as extra