Coinbase App API - support OAuth2

[tiagosiebler]

Recommended for 3rd party apps integrating with the Coinbase App API. Not supported yet by this SDK, but if there is demand for it, please comment in this thread or get in touch:
https://docs.cdp.coinbase.com/coinbase-app/docs/coinbase-app

More detail:
https://docs.cdp.coinbase.com/coinbase-app/docs/coinbase-app-integration#integrating-manually

[ianmaddox]

This would be preferred to API keys.