feat(ngSwitch): Allow multiple case matches for one element

Now you can also use an array in `ng-switch-when`, which allows
specifying multiple values for the same element. Values will
be evaluated within the scope when using the array notation.

I.e. `ng-switch-when=[1, 3, 'hello', 5-3]`

Each element will switch only once even if there are multiple
matches in the same element.

Closes #3410