Hub interface class and supporting code

[fmhall]

Description

Initial, basic, hub interface class and supporting code.

Can be used like this:

from farcaster.hub.generated import request_response_pb2

hub = Hub(mnemonic="x", hub_address="nemes.farcaster.xyz:2283")
request = request_response_pb2.FidRequest(fid=50)
response = hub.client.GetCastsByFid(request)
assert len(response.messages) > 266

Related Issue

Type of Change

• [ ] 📚 Examples / docs / tutorials / dependencies update
• [ ] 🔧 Bug fix (non-breaking change which fixes an issue)
• [ ] 🥂 Improvement (non-breaking change which improves an existing feature)
• [x] 🚀 New feature (non-breaking change which adds functionality)
• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🔐 Security fix

Checklist

• [ ] I've read the CODE_OF_CONDUCT.md document.
• [ ] I've read the CONTRIBUTING.md guide.
• [ ] I've updated the code style using make codestyle.
• [ ] I've written tests for all new methods and classes that I created.
• [ ] I've written the docstring in Google format for all the methods and classes that I used.