Use saved gas parameters for new gas algorithm

[arhag]

Depends on #186 and eosnetworkfoundation/silkworm#122.

Use the gas parameters stored associated with each block (see #186) to pass into the silkworm infrastructure developed in eosnetworkfoundation/silkworm#122 so that evmc can use the appropriate gas parameters when tracking consumed gas.

Update integration test to show how gas parameters can be updated.

Add an integration test to show how gas parameters are handled under forks.