Migrate Provincial Data Backend to python

[noppakorn]

• node is hard to maintain with data.go.th file format changing.
• rewrite get_data.js and process_data.js in python.
• The json output is still the same so it should be plug and play (Minor change in date format).
• Make build_province_graph use json_dump function to make it write file in UTF-8.

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[porames]

Good job. Big brain data scientist.