feat: Add payment type and reference

[brunomiguelpinto]

Context

This PR lays the groundwork for implementing manual/partial payment functionality in our system. It introduces necessary changes to the payments and invoices tables to enable the tracking and management of these new payment types and statuses.

Description

Migration: Add payment_type and reference columns to payments

• Added a new payment_type column as an ENUM with values provider and manual.
• Added a reference column to store additional metadata for payments.
• Backfilled existing records, defaulting payment_type to provider.
• Set payment_type to NOT NULL with a default value of provider.

Migration: Add total_paid_amount_cents column to invoices

• Added a total_paid_amount_cents column to track the cumulative amount paid toward an invoice.
• Backfilled existing records with a default value of 0.
• Set total_paid_amount_cents to NOT NULL with a default value of 0.