feat: Base implementation for Cache Operations

[gautamomento]

import momento.momento as momento

if __name__ == "__main__":
    with momento.init('<AUTH_TOKEN>') as momento_client:
        with momento_client.get_cache("dummy", ttl_seconds=60, create_if_absent=True) as cache_client:
            resp = cache_client.set('MyKey', 'MyData')
            get_resp = cache_client.get('MyKey')
            print(get_resp.result())
            print(get_resp.str_utf8())

[bruuuuuuuce]

do we also want to close the client too? Or does this take care of that

[gautamomento]

The stub doesn't have a close. As per examples and documentation, the channel needs to be closed:
https://github.com/grpc/grpc/blob/v1.41.0/examples/python/helloworld/greeter_client.py#L29

[bruuuuuuuce]

I like this, only Get needs a result

[gautamomento]

Once we are over the SDK spikes, I would like to go cleanup other SDKs as well and potentially remove these results from MR2 responses as well.

[bruuuuuuuce]

same here do we also want to close the client?

[bruuuuuuuce]

a few minor comments, but otherwise lgtm as a first pass