Should array schema include "format" key?

[alegacy]

Does it make sense to include the "format" key within a schema when the type is "array"? For example, I created an array of strings and wanted those strings to be formatted as IPv4 addresses. After fixing #123 to ensure that "format" keys are included for strings I found that the "format" key was included in both the array definition and the "items" definitions. I cannot think of a reason why the outer format would be required.

With this in my types.go struct:

	// +kubebuilder:validation:Format=ipv4
	// list of IP addresses
	Addresses []string `json:"addresses,omitempty"`

I get this in my CRD yaml (notice the "format: ipv4" at both the array and items levels). I am proposing to remove the one at the array level unless there is a reason for this that I have not yet uncovered:

        spec:
          properties:
            addresses:
              description: list of IP addresses
              format: ipv4
              items:
                format: ipv4
                type: string
              type: array