Added support for a generic oauthbearer as the sasl mechanism #379
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Kafka supports using oauth2 as its authentication mechanism, by setting the sasl mechanism to the type "oauthbearer".
To enable a Kafka client to use this mechanism it needs an implementation of a tokenProvider to acquire tokens.
This pull request contains the code for this tokenProvider, the nessecary configuration options (Only an url that supplies oauth2 tokens), and finally the option to choose oauthbearer as the mechanism for this client.
This would close issue #377
The code has been tested thoroughly as requested.