Implement Array ufunc

[andrewgsavage]

• Closes Add Unary Operator Support to PintArrays #221 negating (using __neg__) not working #100 Implement numpy __array_ufunc__ #65
• Executed pre-commit run --all-files with no errors
• The change is fully covered by automated unit tests
• Documented in docs/ as appropriate
• Added an entry to the CHANGES file

[andrewgsavage]

this works locally for me now but will need hgrecco/pint#1677 merging into pint first.

[andrewgsavage]

working locally again with hgrecco/pint#1677 . Will need it merging into pint first.

[andrewgsavage]

nice this works with pint master now