EPIC: Auth Manager support

[rambleraptor]

What's the feature are you trying to implement?

Java and Python have AuthManager support for setting authentication.

I'm borrowing the list of steps from this issue since they should roughly match. Happy to contribute this!

• Create AuthManager class
• Replace existing oauth2 token fetching workflow with a Oauth2Manager
• Expose way for users to use a custom AuthManager when defining REST Catalog

Willingness to contribute

I can contribute to this feature independently

[CTTY]

Hi @rambleraptor , thanks for working on this!

Should we include request signer in this issue? Right now there are catalogs like Glue that implement IRC, but will require a request signer to interact with as an IRC. I think adding the request signer would be very helpful. We can use reqsign which is already a dependency

[liurenjie1024]

Thanks @rambleraptor for contributing this.