(core) Implementing row conditional formatting

Summary:
Conditional formatting can now be used for whole rows.
Related fix:
- Font styles weren't applicable for summary columns.
- Checkbox and slider weren't using colors properly

Test Plan: Existing and new tests

Reviewers: paulfitz, georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3547

app/client/components/ViewPane.ts

@@ -4,3 +4,4 @@
 import ViewConfigTab from 'app/client/components/ViewConfigTab';
 import * as FieldConfig from 'app/client/ui/FieldConfig';
 export {ViewConfigTab, FieldConfig};
+export {ConditionalStyle} from 'app/client/widgets/ConditionalStyle';