fix(f02-mocks): match encoding format against f02's own vectors

Also:

- one set of CBOR primitives
- addresses encode in both forms a contract can hold
- add tryStepWeightRecords over a shared encoder, and guard each field against
  the width f02 declares
- FVMRewardWire.t.sol mirrors actors/reward/tests/types_test.rs, asserting the
  bytes the mock received

Author: rvagg