feat: Store authentication keys in a separate database

[gatici]

Description

The upstream PR requires changes in the charm to use the second database and it's merged.
This PR has dependency to canonical/sdcore-webui-rock#17 which updates webconsole image.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• [] I have made corresponding changes to the documentation
• I have added tests that validate the behaviour of the software
• I validated that new and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have bumped the version of the library

[ghislainbourgeois]

I assume this will require a separate PR to update the rock once the upstream PR is merged, right?

[gatici]

I assume this will require a separate PR to update the rock once the upstream PR is merged, right?

I assume this will require a separate PR to update the rock once the upstream PR is merged, right?

I assume this will require a separate PR to update the rock once the upstream PR is merged, right?

Hello @ghislainbourgeois That's true. After merging Upstream PR, I will create a separate PR to update Webui Rock.