(core) Copy column type and options when pasting into an empty column

Summary:
Adds a `data-grist-col-ref` attribute to the copied HTML, then uses that when pasting to look up the source column and retrieve info about it. Copies the info into the target column if:

- The document is the same (the docId hash matches)
- The source column still exists and has the same type as when copied
- The source type isn't Text, because in that case it's nice if type guessing still happens
- The target column is empty, meaning it has type Any (we check earlier that it's not a formula column)

The info copied is the type, widgetOptions, and reference column settings (visible and display columns) but not conditional formatting.

The changes are mostly in a function `parsePasteForView` which is based on `BaseView._parsePasteForView` but ported to TypeScript in a new file `BaseView2.ts`.

Added a useraction `MaybeCopyDisplayFormula` exposing an existing Python function `maybe_copy_display_formula` because the target column needs a slightly different display formula.

Test Plan: Added a new nbrowser test file and fixture doc.

Reviewers: cyprien

Reviewed By: cyprien

Subscribers: jarek, dsagal

Differential Revision: https://phab.getgrist.com/D3344

app/client/components/CopySelection.ts

@@ -14,6 +14,7 @@ import type {UIRowId} from 'app/common/UIRowId';
  */
 export class CopySelection {
   public readonly colIds = this.fields.map(f => f.colId());
+  public readonly colRefs = this.fields.map(f => f.colRef());
   public readonly displayColIds = this.fields.map(f => f.displayColModel().colId());
   public readonly rowStyle: {[r: number]: object}|undefined;
   public readonly colStyle: {[c: string]: object}|undefined;