Major update to the data service. Added gRPC and socket servers. Switched to using only a single go.mod at the root.

services/data_service/internal/provider/provider.go

@@ -0,0 +1,19 @@
+package provider
+
+import (
+	"gitlab.michelsen.id/phillmichelsen/tessera/services/data_service/internal/domain"
+)
+
+type Provider interface {
+	Start() error
+	Stop()
+
+	RequestStream(subject string, channel chan domain.Message) error
+	CancelStream(subject string)
+	GetActiveStreams() []string
+	IsStreamActive(subject string) bool
+
+	Fetch(subject string) (domain.Message, error)
+
+	IsValidSubject(subject string, isFetch bool) bool
+}