* linting: fix python linting
* fix: get column types from parquet schema for parquet files
* style: python linting
* fix: remove displayType check in test as variation depending on OS
* Add PGSpider service connector
* add sqlalchemy-pgspider to setup.py
* Delete unnecessary code and move files.
* Change to work as a Postgres connector sub-module
* Rebuild PGSpiderLineage class into a set of funcs
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Co-authored-by: Pham Ngoc Son <son1.phamngoc@toshiba.co.jp>