[FEATURE] `Map` data structure

[kurtlawrence]

Description

Implement a Map structure. Implement through ogma itself; def-ty Map { t:Table }.

Considerations:

• [ ] Overload the . to return Map.key = value (string keys...)
• [ ] Will require implementation of modules
• [ ] Will require implementation of better table searching (binary search)
• [ ] Table is just key,value columns
• [ ] Heterogeneous values?
• [ ] Heterogeneous keys?