3rd party endpoint token local storage

[pandu-k]

In order to support private 3rd party models, users will need to pass API tokens alongside requests to Marqo. Users will pass the model’s name and API token (from cURL or py-marqo) which will be used for inferences. The py-marqo client will have the ability to save the model credentials somewhere locally as key-value pairs (which are overwritten by env vars).

In order to provide a user-friendly experience, py-marqo needs a feature to optionally store API keys and retrieve the appropriate ones for requests.

The usage could be something like this:

marqo.add_model_creds(('my-custom-model', 'my-secret-token'))

or this:

marqo.add_model_creds(token=('my-custom-model', 'my-secret-token'), applicable_indexes=["my-ix", "cool-ix-2"])

Which stores it in ~/.marqo/credentials

[pandu-k]

On indexes and searches the pattern could be this:

mq.index("my-ix").add_documents(
    [{"Title": "Where the wild things are"}], 
    models_tokens=["my-custom-model"]
)