Incremental updates for materialized view #6
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Implementation of incremental updates built on the existing SQL Postgres operator.
An explanation of the use case and usage of the operator can be found in the README.md file (subtitle: 'Incremental updates').
Successfully tested: tests/adapters/test_postgres_incremental.py
An example task is also included in the Docker demo: demo/dags/viewflow-demo-2/emails_blog.sql. I changed the folder structure of the DAGs in the demo a bit to be more intuitive.