pygw starter code

[charlesyu108]

Starter code for the pygw project.

Includes:

• Base wrapper models for Python
• Working implementations of RocksDB & Redis datastores and SpatialIndex and SpatialTemporal Index
• A working prototype pipeline for the Simple Feature Ingest Example

See README in python/src/main/python for more info.

[coveralls]

Coverage increased (+0.008%) to 42.215% when pulling 46e1d26 on charlesyu108:python-bindings into a40297d on locationtech:python-bindings.