v1.0.0 Release Candidate 1

Minor release changes

• Add options to retain completed and cancelled jobs. #35
• Add Job to cleanup jobs based on status and age. #35
• Fix up PostgresJobQueue to support job parameters not conforming to JobParameter. #36
• Change PostgresJobQueue.JobPriority to use computed properties instead of functions. #32
• Code changes required by JobProcessor changes in swift-jobs. #38
• Add JobMetadataDriver conformance. #39
• Require Swift 6. #40

Patch release changes

• Add @inlinable to key functions. #37

Other changes

• Replace XCTest with Swift Testing. #40