Added path argument for Ogmios client.

Elder Millenialrequested to merge
eldermillenial/ogmios-python:feat/path into main

This PR adds a path argument to ogmios.Client so that Ogmios servers can be served from a specific path.

For example, if an Ogmios is served from home.local/mainnet/, it is now possible to connect using:

with ogmios.Client(host="home.local", port=80, path="mainnet"):
    ...

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