#15 tasklist status endpoint

cmd/task/main.go

docs/task-list.md

internal/listexecutor/listexecutor.go

internal/service/tasklist/service.go

internal/service/tasklist/service_test.go

internal/service/tasklist/tasklistfakes/fake_cache.go

internal/service/tasklist/tasklistfakes/fake_storage.go

internal/storage/storage.go