feature: add support to initialize genesis contracts by function call

[zhiqiangxu]

Currently the genesis contracts can only be initialized by manually specifying the state variables here.

It becomes hard if the state variable to initialize is a mapping or there're multiple inherits involved, it's boring to manually gather all the state variables modified .

In general, it's more feasible to allow initializing the contracts by function call instead, which is more flexible.

[tynes]

We will shortly be rewriting the L2 genesis generation in solidity to decouple releases of the predeploys from releases of op-node. You are correct that our storage setting library doesn't support mappings right now, its possible to add but we didn't need it so we didn't implement it at the time