Add support for `contractSlotValues` query in Provider

[Torres-ssf]

Consider adding a method to the Provider class to support the new contractSlotValues query:

  """
  Get storage slot values for a contract at a specific block height.
  Use the latest block height if not provided.
  Requires historical execution config to be enabled.
  """
  contractSlotValues(
    contractId: ContractId!
    blockHeight: U32
    storageSlots: [Bytes32!]!
  ): [StorageSlot!]!

This was introduced in the fuel-core 0.43 upgrade.