Separate `pytest_ethereum` from package or make conditionally install

### What feature should we add?

A way to avoid the pytest entry point for the `pytest_ethereum` plugin.
Right now, I am doing `-p no:pytest_ethereum` everywhere because of the `eth-typing` 5.0.0 thing, but perhaps a more minimal install of `web3.py` w/o the Pytest plugin would be helpful for frameworks like Ape which are using their own pytest plugin.