DataTable: Column header always rendered in a span element

Describe the bug

Passing a custom header element to the Column always renders it inside the <span>, which is often not correct for accessibility. A lot of elements can not be rendered as children of span e.g. div.

Reproducer

https://stackblitz.com/edit/xuskzp8u

System Information

primereact: 10.9.7

Steps to reproduce the behavior

1. Create a DataTable
2. In one of the columns provide a header prop that is not a simple string value, but a function returning some element e.g.
3. Inspect page. Notice that the is rendered inside a which is not correct.

Expected behavior

If the custom header is provided it should render it inside a div instead of span to maintain correct accessibility.

Start with the DataTable and Column header rendering used by the linked StackBlitz reproducer, then trace where custom header content is wrapped. Confirm the current markup for string and element headers, and verify that custom elements no longer receive an invalid span wrapper while ordinary headers retain their expected behavior.