Implement Box Types

[chaitan94]

For each of the box types defined in MobilityDB, a class that implements the data structure and relevant functions needs to be defined, similar to how we already defined for time types (like Period etc), range types (like Range<int> etc) and temporal types (like TSequence<float> etc).

Specifically:

• [x] TBox
  • [x] C++ implementation and tests
  • [x] Python bindings and tests
• [x] STBox
  • [x] C++ implementation and tests
  • [x] Python bindings and tests

Check MobilityDB's documentation on Box Types: https://docs.mobilitydb.com/nightly/ch04.html

For an example implementation, check code for Period class: https://github.com/chaitan94/meos/blob/master/meos/types/time/Period.cpp (along with its header file in include folder)

[chaitan94]

Basic box type support now in place as of https://github.com/chaitan94/meos/commit/90e9d7e166bae2a51c1e9a7b44c323c9149024bb