[FEATURE] Support multi-source Effectivity Satellites

[DVAlexHiggs]

Is your feature request related to a problem? Please describe. In the case where multiple sources feed a Link, we will also need to track multiple sources in an Effectivity Satellite, which is not currently supported by dbtvault.

Describe the solution you'd like Allow multiple sources to be provided to the source_model parameter and handle the multi-sources in the eff_sat macro.

Describe alternatives you've considered Having a single effectivity satellite per Link could work but this is awkward and not ideal.

Additional context Highlighted by a user on Slack