BigQuery Reservation Adds Edition Upgrade API

A new method, projects.locations.upgradeEdition, has been introduced. This method accepts an UpgradeEditionRequest which specifies the targetEdition (e.g., ENTERPRISE, ENTERPRISE_PLUS) and a list of capacityCommitments and/or reservations to upgrade. The API ensures that upgrades are only to higher editions and validates resource requirements before proceeding. This provides a programmatic way to manage your BigQuery reservation tiers.