Disable sending of non eip155 replay protected tx by default

[renaynay]

Geth recently implemented this change here: ethereum/go-ethereum#22339. It would be nice if Besu would also disable sending of non EIP155 transactions by default (see reasoning in linked PR).

[atoulme]

Thanks Rene for the report. I believe this is a straightforward change and should be implemented by Besu as well. We can adopt a flag like Geth did to allow non EIP155 transactions, but by default they should be forbidden.