Features Updates + custom schema (breaking change 🚨)

This release incorporates the following new features:

• Databricks and Postgres compatibility
• Custom schema integration (breaking change 🚨)
• Addition of the shopify__transactions table which includes all transactions within shopify and an exchange rate calculation applied
• Overhauled shopify__orders, shopify__order_lines, and shopify__customer_cohorts tables to include refund calculations towards the order totals.
• Removed duplicate customer total orders and total amount fields from the shopify__customers final model (breaking change 🚨)