Make manifests usable by Kustomize

[karpoftea]

1. Group manifests by purpose
2. Add kustomization.yaml for each group to benefit for users that prefer Kustomize
3. Move examples to appropriate folder

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[karpoftea]

@googlebot I fixed it.

[liyinan926]

I think somehow we need to disable one of the check for CRD drift between manifest and the chart folder.

[karpoftea]

I think somehow we need to disable one of the check for CRD drift between manifest and the chart folder.

thanks! i'll see what i can do and submit a change

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

[karpoftea]

I've simply added --exclude=kustomization.yaml to diff expression in order to exclude kustomization manifest from CRD drift check