Enforce boolean ascending for sort_values

[charlesbluca]

It is possible to pass a list of ascending booleans to sort_values, which is not yet supported by _calculate_divisions (which computes divisions in ascending order), and can cause undefined behavior.

This small PR adds a check that ascending is a boolean before calling rearrange_by_divisions; note that this check happens after all single-partition cases are handled, as Pandas can handle lists of ascending booleans.

• Closes #xxxx
• Tests added / passed
• Passes pre-commit run --all-files

[ian-r-rose]

Thanks @charlesbluca , can you also add a test demonstrating this behavior?

[jsignell]

This looks nice! Just missing a test like Ian mentioned.

[jsignell]

@charlesbluca, I think if you merge or rebase off main, lots of these tests will pass.

[charlesbluca]

Thanks @jsignell, merged in the latest

[jsignell]

Thanks @charlesbluca!