test(ssz): Add parity and benchmark tests to our ssz impl

[chibera]

We've done a lot of TDD to make progress on ssz, so theres a good amount of tests in there that can be continuously integrated as we flesh out the de/serializer.

serializer spec parity and benchmark tests

• simple type - bool
• simple type - uint8
• simple type - uint64
• fixed type - byte array or uint8 array
• fixed type - fixed length, array or slice, of u64
• composite struct
• variable length slice/arr
• full block - bellatrix
• local genesis block - deneb

deserializer spec parity and benchmark tests

• simple type - bool
• simple type - uint8
• simple type - uint64
• fixed type - byte array or uint8 array
• fixed type - fixed length, array or slice, of u64
• composite struct
• variable length slice/arr
• full block - bellatrix
• local genesis block - deneb

bijective property test - i.e. for our serializer: data == deserialize(serialize(data))

• full block - bellatrix
• local genesis block - deneb
• ghost block testing via AR ?

EF spec tests

• testing(ssz): Integrate Ethereum Foundation spectests against our implementation. #810

Parent: #808