Implement support for London #11390
Description
Most of the London changes will not affect us (based on the latest testnet:
1559 changes gas price / block gas limit calculation, don't think we need to do anything with this.
3198 introduces a new BASEFEE opcode, we may want to expose this as block.basefee
3529 reduces gas refunds on selfdestruct and sstore, we may want to update our documentation on this regard.
3541 runtime code starting with the 0xef byte can not be deployed, we could display a warning for this hypothetical case, but it won't be generated by our assembler anyway.