QOC beta release

This is the first official beta version release of qutip-qoc.
The current project features two new optimization routines (GOAT, JOPT) and a fresh optimization interface.
It also provides the familiar qutip-qtrl methods (CRAB, GRAPE) leading to a temporary dependency on it.
The first proper version release will no longer require this dependency however.

Finally, this version is supposed to allow early access for interested users while encouraging feedback from the community.