Implement more containers

[JeanPhilippeKernel]

• HashSet
• UnorderedHashSet
• HashMap (with sorting keys support)

[JeanPhilippeKernel]

@jnyfah maybe you want to take a look at this :)

[JeanPhilippeKernel]

The existing implementation of HashMap is actually an UnorderedHashMap, probably we might want to review the name to make distinction