[BUG] add validation for generate loops

[JimBugwadia]

Software version numbers

• Kubernetes version: all
• Kyverno version: 1.3.6

Describe the bug

A generate policy can be written to match and generate the same resource type.

To Reproduce

Create a policy with a generate rule that matches a Deployment and generates a Deployment.

Expected behavior

Kyverno should not allow a creation of a generate policy where the matched kind is the same as the generated kind, and no other filters are provided. This can be added to the policy validation checks.

The same check should also be done when a pod is the matched kind and a pod controller is created, or a pod controller is the matched kind and a pod is created, and no other filters are provided.

Screenshots
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Additional context

See: https://twitter.com/noelgeorgi/status/1392002713521516544 and #1905.