* add ui for maintenance
* valid config loading. fix workers page.
* refactor
* grpc between admin and workers
* add a long-running bidirectional grpc call between admin and worker
* use the grpc call to heartbeat
* use the grpc call to communicate
* worker can remove the http client
* admin uses http port + 10000 as its default grpc port
* one task one package
* handles connection failures gracefully with exponential backoff
* grpc with insecure tls
* grpc with optional tls
* fix detecting tls
* change time config from nano seconds to seconds
* add tasks with 3 interfaces
* compiles reducing hard coded
* remove a couple of tasks
* remove hard coded references
* reduce hard coded values
* remove hard coded values
* remove hard coded from templ
* refactor maintenance package
* fix import cycle
* simplify
* simplify
* auto register
* auto register factory
* auto register task types
* self register types
* refactor
* simplify
* remove one task
* register ui
* lazy init executor factories
* use registered task types
* DefaultWorkerConfig remove hard coded task types
* remove more hard coded
* implement get maintenance task
* dynamic task configuration
* "System Settings" should only have system level settings
* adjust menu for tasks
* ensure menu not collapsed
* render job configuration well
* use templ for ui of task configuration
* fix ordering
* fix bugs
* saving duration in seconds
* use value and unit for duration
* Delete WORKER_REFACTORING_PLAN.md
* Delete maintenance.json
* Delete custom_worker_example.go
* remove address from workers
* remove old code from ec task
* remove creating collection button
* reconnect with exponential backoff
* worker use security.toml
* start admin server with tls info from security.toml
* fix "weed admin" cli description
