SizeAtLeast, SizeBetween and SizeAtMost for knownvalue

[zliang-akamai]

An example:

{
	ConfigStateChecks: []statecheck.StateCheck{
		statecheck.ExpectKnownValue(
			resourceName,
			tfjsonpath.New("some_attr"),
			knownvalue.SetSizeAtMost(3),
		),
		statecheck.ExpectKnownValue(
			resourceName,
			tfjsonpath.New("some_attr"),
			knownvalue.SetSizeAtLeast(1),
		),
		statecheck.ExpectKnownValue(
			resourceName,
			tfjsonpath.New("some_attr"),
			knownvalue.SetSizeBetween(1, 3),
		),
	},
}

It only has SetSizeExact today. Similar stuff can be applied to List and Map. I can put up a PR if you guys can confirm this feature is needed.