Add gRPC server implementation and database integration for marketplace and products

internal/marketplace/db/schema.sql

@@ -0,0 +1,9 @@
+create table marketplaces
+(
+    id                           serial
+        primary key,
+    base_marketplace             integer                                        not null,
+    name                         varchar                                        not null,
+    auth_data                    varchar,
+    warehouse_id                 varchar
+);