Support OAuth2 authentication #809
Merged
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This commit introduces OAuth2 settings (token endpoint URI, client secret, etc) in the stream environment builder. When OAuth2 is in use, the library fetches a token from the HTTP(S) endpoint and use it to authenticate against the broker. The library also takes care of refreshing tokens: when a token is about to expire, a new one is fetched, and connections re-authenticate.
Fixes #781