The unittest ASSERT_THAT/matchers API has some matchers that compose other matchers so that they "match" when AnyOf or AllOf the matchers they compose over match. 

But these composing-matchers only work over a statically sized pack of matchers, not a dynamic range (like a std::vector). Let's add some similar matchers that work over a dynmically sized range, using something like the STL (begin, end) iterator range APis.