v0.2.0 of nostr_event_scheduler

Local-first Dart package for scheduling Nostr events via Scheduler DVMs. Changelog excerpt: - Add scheduled package support via kind:31234manifests that group one or more Scheduler DVM kind:5905jobs. - Add schedulePackage, cancelPackage, listPackages, listSchedules, and schedulesStream. - Add ScheduledPackage, SchedulePackageItem, and ScheduledItemmodels. - Broadcast Scheduler DVM requests to both the user's NIP-65 relays and the target DVM's read relays. dvmReadRelayscan be supplied as a fallback when the DVM NIP-65 list is unavailable. - Cancel scheduled package[...]