Stable Release for CakePHP 4

Main improvements

• Decoupled from old Shell/Task system as well as proxied to ConsoleIo using Io adapter class to avoid direct coupling
• Now plugin and app tasks can coexist with the same name (MyTask vs MyPlugin.MyTask)
• Allow adding command also by FQCN::class usage via QueuedJobsTable::createJob()
• Includes migrating command to quickly make your existing tasks compatible.
• Added "Reusable emails support" for Email task using action key
• Added currently active job to worker processes view
• Added "flush" functionality to remove failed jobs from the queue

BC breaking changes

• job_type field of queued_jobs table has been renamed to job_task
• Tasks have been moved to new namespace (use migrating tool to migrate)
• CLI commands have been renamed, see bin/cake overview for details.