feat: add VLAN Groups to Nautobot Operator

[abhimanyu003]

This PR adds VLAN Groups sync support to the Nautobot Operator.

The operator now reads Rack Groups defined in a Kubernetes ConfigMap and ensures they are created and kept in sync with Nautobot via the Nautobot API.

flowchart
    n1["Nautobot Operator"]
    n2["Kubernetes VLAN Groups ConfigMap"]
    n3["Nautobot API"]

    n1 --> n2
    n2 --> n3

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Sample config map it will sync from

apiVersion: v1
kind: ConfigMap
metadata:
  name: vlangroup-config
  namespace: default
data:
  vlangroups.yaml: |
    - name: f20-2-1f-storage
      location: IAD3
      ucvni_group_name: spine402-storage-path-A
      range: 100-200
    - name: f20-2-2f-storage
      location: IAD3
      ucvni_group_name: spine402-storage-path-B
      range: 100-200
    - name: f20-3-1f-storage
      location: IAD3
      ucvni_group_name: spine402-storage-path-A
      range: 2000-3000
    - name: f20-3-2f-storage
      location: IAD3
      ucvni_group_name: spine402-storage-path-B
      range: 2000-3000