Expose nodeselector and affinity keys in Helm chart

[mach-kernel]

I want to deploy Spice on its own K8S nodegroup. To do so, I need to be able to set the node selector key to match my Karpenter provisioner.

Example value:

affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
      - matchExpressions:
          - key: karpenter.sh/provisioner-name
            operator: In
            values:
              - spice

helm template:

# Source: spiceai/templates/spiceai.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: release-name
  labels:
    app: release-name
spec:
  replicas: 1
  selector:
    matchLabels:
      app: release-name
  template:
    metadata:
      labels:
        app: release-name
      annotations:
        checksum/spicepod: d78b43d9c95e511b38cc1449cb06d3c7e2139705f05014f45c01c0d65ba2e327
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: karpenter.sh/provisioner-name
                operator: In
                values:
                - spice
      containers:
        - name: spiceai
          image: spiceai/spiceai:0.12.1-alpha
          imagePullPolicy: Always