Lean Client for Single Provider

[johnclary]

This PR refactors api as a standalone package. It deviates from the original client in that it:

• interfaces with only single provider
• drops the internal auth.py and provider.py dependencies in favor of url, auth_type, token, and headers args.
• does not interact with the provider registry at all or attempt OAuth

I don't expect this to be merged, but hopefully it contributes to the conversation around #35

[thekaveman]

@johnclary I'm not sure if you meant to submit this as a pull request, but I won't be able to accept this since it deletes the other parts of the library we are currently using in production.

I'm happy to discuss refactoring the ProviderClient or api module more to help your use-cases. You may also want to check out the work/ideas presented by @ezheidtmann in #46, which is similarly trying to improve the ProviderClient.

[johnclary]

@thekaveman i understand.

I don't expect this to be merged, but hopefully it contributes to the conversation around #35

Will look for activity on related issues and help where I can.

[thekaveman]

Definitely helps the conversation, thanks!

[thekaveman]

And apologies, I was too hasty in reading through your initial description and the code changes that I missed the line about this being more an exploration of an idea.