PintArray from Quantity arrays directly

[andrewgsavage]

• [x] Closes #88 (insert issue number)
• [x] Executed pre-commit run --all-files with no errors
• [x] The change is fully covered by automated unit tests
• [ ] Documented in docs/ as appropriate
• [x] Added an entry to the CHANGES file

[hgrecco]

LGTM

[andrewgsavage]

bors r+

[bors[bot]]

Build succeeded:

• ci
• lint

[MichaelTiemannOSC]

Eagerly waiting!!!