Add detailed-by aria tag switch to task list component to help facilitate long form hint text

[wellhairy]

What

Add the ability to use aria-details as part of a task list instead of aria-describedby.

Why

To provide a more detailed information to tasks lists as part of a learning plan.

More information

Both aria-details and aria-describedby provide additional information related to another element. The main difference is that the aria-describedby is used to convey a short description where the aria-details is used to provide additional information or complex descriptions. The main use of this will be to add bulleted lists to task descriptions.

Documentation & links

https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-describedby
https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-details
https://nhsuk.github.io/nhsuk-frontend/components/task-list/index.html