Performance Improvement on Python API

[cmpute]

I did some changes to the python version API:

1. Point clouds and images are stored separately to improve serialization performance of large point cloud
2. Add type hints to builder classes for better class inference
3. Remove the logger option as the logging in Python is handled in a different way from Javascript. The logging module provides centralized management, so I change the code to directly used the default logger for better clarity and easier maintenance.

[twojtasz]

Looking at this now.

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