Add genericset,genericmap,bag and record data types

[jp-fizzbee]

• genericset and genericmap can handle non-hashable types as well. At present, it is not sorted in any form except when printing to string form. So, most operations are O(n)
• bag is like list but unordered (or think of it as set that allows duplicates.) It is implemented by keeping the list sorted instead of using the insertion order
• record is mutable record