RCS1077 for Intersect and Except

[bricelam]

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RCS1077 should recommend replacing these patterns:

a.Where(b => c.Contains(b));
x.Where(y => !z.Contains(y));

With these instead:

a.Intersect(c);
x.Except(z);

In LINQ-to-objects this will remove nested loops resulting in better perf.