[Feature request] Support OAuth Authorization Code Flow

[jnv]

Many of possible capabilities will be tied to user credentials, ie. user authorizes an app to act on their behalf. This is usually achieved via Authorization Code Flow. Example use-cases include:

• Sending a tweet on user's behalf,
• Fetching data from Google Analytics from a property managed by the user,
• Managing ad campaigns on Facebook, Google Ads, and elsewhere,
• Accessing user's private repositories on GitHub.

Resources

• Research notes on Oauth Security Scheme [internal]