Tests: don't use editable mode, use import-mode=append (openai#2429)

Updated registration.py (openai#2375)

* Updated registration.py

* Blacken

Bump version to 0.19.0

0.18.3 and release notes

update release note date

0.18.1 and release note

0.18.0 release, release notes

0.17.3 release and notes

0.17.2 and release notes

expand cloudpickle range (openai#1836)

* expand cloudpickle range

* 0.17.1 release note