🌱 Allow string validation on XIntOrString

[cbandy]

This allows maxLength and MinLength on x-kubernetes-int-or-string fields. The former helps limit CEL validation costs.

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[JoelSpeed]

This seems reasonable, thanks!

One question, if I were to use this feature, and provide a value that is a long integer, does the length of my integer, say 12 characters, also get validated with the same maximum length constraints? I assume the answer is yes but I'm not sure I see how the tests might demonstrate that this works