feat: add tolerations, affinity, node selector

[olevski]

This allows the session to be scheduled on a specific nodes. It also allows for tolerations to be specified so that node taints can be handled.

[olevski]

This change is part of the following stack:

• 714

  • 715

    • 737 ◀

_{Change managed by git-spice.}

[olevski]

Note that these 2 files are auto-generated:

• api/v1alpha1/zz_generated.deepcopy.go\
• config/crd/bases/amalthea.dev_amaltheasessions.yaml

It is exactly in these 2 files that we have the biggest changes.