✨ Allow RFC6902 patches and strategic merge patches for provider manifests

[hjoshi123]

What this PR does / why we need it:

Allow JSON merge patches and RFC6902 for provider manifests, this makes it possible to modify provider manifests consistently across releases, for example, if the user needs to change labels/annotations on objects, example usage:

patches:
    - patch: |-
        apiVersion: apps/v1
        kind: Deployment
        metadata:
          name: not-used
        spec:
          template:
            metadata:
              annotations:
                cluster-autoscaler.kubernetes.io/safe-to-evict: "true"        
      target:
        kind: Deployment
        name: hello-world
        namespace: sample

This still uses the same patch library. This PR doesn't remove the existing field but introduces a new one and in the future versions of the operator we can deprecate the existing manifestPatches field in favor of a more generic patches field.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #792

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[nalum]

Looking good, just a few comments.

One question I have on the merge patch is around the requirement for the apiVersion key. I know you don't likely have an answer for the reasoning behind that but is that still the case for the new patching setup?

[nalum]

This looks like it will fail the test based on the existing test.

I would update this to use it's own set of patch data as you want to test all patch types that this supports.

[hjoshi123]

Yes I am writing more tests. The one I added was just a basic test to see if merge patch works.. and I ran the tests in local and it does patch and tests pass.. I will add more for RFC6902 patches

[hjoshi123]

I did add a test regarding jsonpatch and it passed.. let me know if the code looks good.

[nalum]

Should also update the patching provider manifests page.