* state-surgery: add solc package

Move types into solc package that are associated
with solc. Add `CompilerInput` and `CompilerOutput`
types.

* state-surgery: clean up hardhat package

Use some solc types

* state-surgery: add state package

Implement some of smock's utils in go

* state-surgery: cleanup

* state-surgery: refactor + add better test coverage

* state-surgery: cleanup

* state-surgery: add tests for merging storage slots

* state-surgery: godoc

* state-surgery: more tests

* state-surgery: more cleanup