ComparableTypeAssertions should have BeOneOf method

Because `ComparableTypeAssertions` doesn't contain `BeOneOf`, the following code doesn't work:

```cs
float testFloat = 12f;
var testTuple = (1, 2);

testFloat.Should().BeOneOf(12f, 13f); // Works
testTuple.Should().BeOneOf((1, 2), (1, 3)); // Doesn't work
```

I don't see any technical reason why the latter shouldn't work, so how about adding `BeOneOf` to `ComparableTypeAssertions`?