Refactor store interfaces and provide database as example implementation

controller/store/deviceStore.go

controller/store/device_store_test.go

controller/store/generic_store_test.go.wasd

controller/store/pndStore.go

controller/store/pnd_store_test.go

controller/store/sbiStore.go

controller/store/sbi_store_test.go

controller/store/storageMode.go

controller/store/utils.go

controller/test/integration/nucleusIntegration_test.go

controller/test/plugin/faulty/gostructs.go

controller/test/plugin/gostructs.go

docker-compose.yml

go.mod

go.sum

gosdn.clab.yaml

scripts/test-add-device.sh

scripts/test-add-pnd.sh