This commits adds new pytest fixtures in prepation for the
migration of unittest.TestCases to pytest test cases. The handling
of temporary dir creation was also changed so that we can use
the pytest tmpdir fixture after the migration.

If a future was passed as the only positional parameter it would
be assigned to the "timeout_ms" parameter erroneously. This mistake
would not raise any exception but would lead to odd behaviour later,
what could make it extremely difficult to troubleshoot.

Adding a type check ensures that an exception is raise earlier to
notify the user about the problem.

* Use hardware accelerated CRC32C function if available

* Add doc notice of optional `crc32c` package