Add mqdt

[johannes-moegerle]

Notes

• should exp and std "ignore" Unknown quantum numbers by:
  • a) by setting them to 0 but still divide by the full norm
  • b) or only divide by norm without the unknown quantum numbers
• for now option b), i.e. not setting them to 0, but really completely ignoring them

TODO future PR

• how to properly handle AngularKet species replace "_mqdt" -> clean up and split species objects

[Copilot]

Pull request overview

Copilot reviewed 51 out of 52 changed files in this pull request and generated 5 comments.