…tuses in etcd

…ls that have training\validatin status

…orkers, add unit test for pending model storage

…ice, add daemon service suite

* feat(training): add public model storage

* test(training): add unit test for public model storage

* feat(training/storage): add methods to update publicModelIds and pendingModelIds

* test(training/storage): add TestPendingModelStorage_AddPendingModelId and TestPublicModelStorage_AddPublicModelId

* feat(training/service): add public models handling in verifySignerHasAccessToTheModel, update createModelDetails

* test(training): add usage newTrainingService instead of NewDaemonService

* feat(training): add error.go for training module

* feat(training/service): add custom errors, update error handling logic in verifySignerHasAccessToTheModel, add verifyCreatedByAddress

* test(training): add new functional tests for GetModel, GetAllModels, CreateModel, ManageUpdateStatusWorkers

* refactor(training): rename daemon_service_test.go to service_test.go

# Conflicts:
#	snetd/cmd/components.go
#	training/service.go
#	training/tests/integration/daemon_service_test.go