Overhaul viewer-based credentials for Databricks & Snowflake #894
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This commit takes a second stab at the viewer-based credential support added in #853.
It contains two major changes:
Users no longer need to pass a
session
argument. We figure it out internally instead. This allows users to deploy apps to Connect with no code changes.The underlying code to get these credentials is now hosted in the
connectcreds
package, which also provides a number of nice mocking features we can use inodbc
's unit tests. Theconnectcreds
implementation is based on the code that this commit removes, though it has a number of improvements as well, so this should be a net win, too.Unit tests and documentation is included.