Display all model compatibility errors at once

[vitorbaptista]

If there are multiple incompatibilities between the dbt docs and Metabase, displaying them all at once makes it much easier to fix. This allows the user to fix all errors at once, instead of fixing one, running dbt-metabase, fixing the next one, and so on.

[vitorbaptista]

Thanks for merging and releasing a new version so quickly (and, of course, the project itself -- it's super useful!)