add feature to fake proofs for testing (#261)
* add feature to fake post validation for testing
* add separate bundle for testing with fake window post
* rename fake-post-validation feature to fake-proofs
* moar fake proofs
* fix map
* reify min consensus power to runtime policy
* match behaviour of fake valid_post in lotus mocks
* rustfmt
* generics to better organize fake proofs
* fix tests
* rustfmt
* fix test_vm
* rename testing-fwp to testing-fake-proofs.
Co-authored-by: raulk <raul@protocol.ai>
