feat!: allow clip to have int min or max when x is floating-point

[asmeurer]

This is for consistency with operators, which allow combining an int with an array that has a floating-point data type.

See the discussion at #807.

I also mentioned this at the meeting last week.

[asmeurer]

I also made it clearer that if all three arguments are arrays then there is a three-way broadcast.

[asmeurer]

Note that if we decide to fix #807 more generally we may want to just remove the specific language for promotion behavior for Python scalars from clip and fold it into the type promotion page (which would also imply this change).

[kgryte]

I've opened another PR which should supersede this one (see https://github.com/data-apis/array-api/pull/896) and includes the 3-way merge edits (including backport) which was included here.