* op-chain-ops: delete memdb

The simple in memory statedb implementation that was
backed by a genesis has served us well but is no longer
required since we build the genesis files using foundry.
This was originally used to enable simple execution to
deploy contracts and then dump into a `genesis.json`.
Keeping this memdb around will only bloat PRs that update
the geth version as they may change the interface to the
statedb. Instead of using the memdb interface, the genesis
is modified directly.

* lint: fix

* style: way better
Co-authored-by: protolambda <proto@protolambda.com>

* build: fix

* build: fix

---------
Co-authored-by: protolambda <proto@protolambda.com>