expose more functions from role-helpers

Describe the feature you'd like:

Expose all the computeAriaXXX functions from role-helpers to provide greater flexibility for test authoring. This would enable writing tests like this:

const optionsList = within(getByRole(document.body, 'listbox', { name: /Options list/ }));

expect(
    optionsList.queryAllByRole('option').map(e => ({
        name: computeAccessibleName(e),
        selected: computeAriaSelected(e),
    }))
).toEqual([
    {  name: 'manager1', selected: true },
    {  name: 'external2', selected: false },
]);

Here, we combine the verification of the order and the specific ARIA properties for each option into a single expectation. Otherwise, it would require at least two steps to achieve the same result.

expect(optionsList.queryAllByRole('option').map(e => computeAccessibleName(e))).toEqual(['manager1', 'external2']);
expect(optionsList.queryByRole('option', { name: 'manager1', selected: true })).toBeDefined();
expect(optionsList.queryByRole('option', { name: 'external2', selected: false })).toBeDefined();

Start by locating the role-helpers module and its public exports, then inspect how the existing computeAccessibleName helper is exposed and tested. Expose the computeAriaXXX functions requested by the issue, and confirm they can be imported for assertions like the example.