Support using complex numbers and lists in kernel functions

[annagrin]

Required prerequisites

• Search the issue tracker to check if your feature has already been mentioned or rejected in other issues.

Describe the feature

This is a parent issue for supporting using complex numbers and lists in kernel functions.

The work is split up into the following parts:

• Support complex numbers and lists of complex numbers defined inside, passed as parameters, or captured by kernel functions

  • #1548
  • #1550

• Support np.complex arrays defined inside, passed as parameters, or captured by kernel

  • #1523

• Consider supporting half or quad precision complex and float numbers

  • TODO

• Return complex numbers from kernel functions

  • #1608
  • #1610

[schweitzpgi]

@annagrin This one may be complete now too. Please close if warranted.