Merge metabase/meta/metadata/* into metabase-lib/lib/metadata/*, port existing code

frontend/src/metabase-lib/lib/metadata/Database.js

frontend/src/metabase-lib/lib/metadata/Field.js

frontend/src/metabase/admin/permissions/selectors.js

frontend/src/metabase/dashboard/selectors.js

frontend/src/metabase/lib/permissions.js

frontend/src/metabase/meta/Dashboard.js

frontend/src/metabase/meta/metadata/Base.js

frontend/src/metabase/meta/metadata/Database.js

frontend/src/metabase/meta/metadata/Field.js

frontend/src/metabase/meta/metadata/Metadata.js

frontend/src/metabase/meta/metadata/Table.js

frontend/src/metabase/meta/metadata/memoize.js

...query_builder/components/template_tags/TagEditorParam.jsx

frontend/src/metabase/selectors/metadata.js

frontend/test/unit/meta/Metadata.spec.js