Add & fix tests; add missing docstrings; add logging; refactor

resources/automagic_dashboards/GenericTable.yaml

src/metabase/api/automagic_dashboards.clj

src/metabase/automagic_dashboards/core.clj

src/metabase/automagic_dashboards/populate.clj

src/metabase/automagic_dashboards/rules.clj

test/metabase/api/database_test.clj

test/metabase/api/field_test.clj

test/metabase/api/table_test.clj

test/metabase/automagic_dashboards/core_test.clj

test/metabase/automagic_dashboards/rules_test.clj

...metabase/feature_extraction/automagic_dashboards_test.clj

test/metabase/sync_database_test.clj