[helm]: Make azureIdentities.identity.binding optional

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Describe the bug

We want to be build to define some azure identities when creating the helm chart but without defining any binding.

Currently this fails with:

Error: template: aad-pod-identity/templates/identities.yaml:29:21: executing "aad-pod-identity/templates/identities.yaml" at <$value.binding.name>: nil pointer evaluating interface {}.name

Steps To Reproduce

Use this values.yaml

azureIdentities:
  testid:
    name: "testid_name"
    namespace: "namespaceA"
    type: 0
    resourceID: "12"
    clientID: "12"

Expected behavior

When no binding is defined, only the AzureIdentity resources should be created

AAD Pod Identity version 1.8.2

Kubernetes version v1.20.7

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