Add `ignore-paths` to diff

[jcogilvie]

What problem are you facing?

When running argocd we get diffs like this:

  apiVersion: apiextensions.crossplane.io/v1
  kind: Composition
  metadata:
-   annotations:
-     argocd.argoproj.io/tracking-id: some-id
-     kubectl.kubernetes.io/last-applied-configuration: |
-       {... configuration here ...}
-   labels:
-     argocd.argoproj.io/instance: some-instance
+   labels:
      provider: aws
      service: kms
    name: composition.example.com

How could Crossplane help solve your problem?

Allow me to ignore certain paths when calculating the diff.

crossplane-diff comp composition.yaml --ignore-paths=metadata.annotations[argocd.argoproj.io/tracking-id],metadata.annotations[kubectl.kubernetes.io/last-applied-configuration],metadata.labels[argocd.argoproj.io/instance]

or similar.

[jtucci]

Additionally, I think some generated fields like last applied configuration should be excluded by default