Prune MaxTxNums table

[Giulio2002]

Main change is as follow that we can customize the seek in TxNumsReader now, so if you have a block reader you can inject it and use that instead than having the index in DB for antiquated snapshots. I did not implement live pruning for this yet as it is probably growing really slowly

[Giulio2002]

erigontech/interfaces#228

[AskAlexSharov]

Need implement FindBlockNum method:

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_getLogs", "params": [ {"fromBlock":2500300, "toBlock":2500400}], "id":1}' http://localhost:8545

{"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"FindBlockNum(5001315): seems broken TxNum value: 0000000000000000 -\u003e (456d70, 0); last in db: (9099999, 30181416)"}}