itest: Add a FEVM itest for block properties.

[Stebalien]

We need an integration test in lotus for several block properties:

• blockhash -- the digest from the tipset CID.
• block.basefee
• block.chainid (

  lotus/build/params_mainnet.go

  Line 136 in 61f29a8

  const Eip155ChainId = 314

  )
• block.number (epoch)
• block.timestamp (from the block header)

These can't be tested in the FVM itself as they depend on information from lotus (exposed through the FFI).

See https://docs.soliditylang.org/en/v0.8.18/units-and-global-variables.html#block-and-transaction-properties