Post Rendering Patches

[turkenh]

It should be possible to provide post rendering patches which will make last mile configurations using
post rendering option of Helm. spec.forProvider.patchesFrom
array will be used to specify patch definitions satisfying kustomizes patchTransformer interface.

Example:

patches:
- patch: |-
    - op: replace
      path: /some/existing/path
      value: new value
  target:
    kind: MyKind
    labelSelector: "env=dev"
- patch: |-
    - op: add
      path: /spec/template/spec/nodeSelector
      value:
        node.size: really-big
        aws.az: us-west-2a
  target:
    kind: Deployment
    labelSelector: "env=dev"

More context: crossplane/crossplane#1642 (comment)
Design doc: https://github.com/crossplane/crossplane/blob/master/design/one-pager-helm-provider.md#crossplane-helm-provider