[BUG] Transplant python/cuspatial/demos into notebooks and update for new APIs

[trxcllnt]

We should transplant the demo python files into notebooks. We can use cuDF's read_json() to read the demo data instead of parsing the JSON in C++ and producing intermediate binary files.

[zhangjianting]

Agree. Good idea.

[harrism]

We should also make sure we have notebooks demonstrating newer features like spatial join and filtering

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