Add a method to get the core/legacy apiresources

[shawkins]

Is your enhancement related to a problem? Please describe

To facilitate walking all resources, either internally or by user code, the core resources should be exposed.

Describe the solution you'd like

Like the logic in PluralizeIT, there should be a call returning an apiresourcelist from /api/v1

Describe alternatives you've considered

No response

Additional context

No response

[manusa]

kubernetes-client/kubernetes-itests/src/test/java/io/fabric8/kubernetes/PluralizeIT.java

Lines 56 to 57 in 0d49d84

	testCases = new ArrayList<>(new OperationSupport(client)
	.restCall(APIResourceList.class, "api/v1").getResources());