Introduce structs/interfacess for new storage units

This commit simply splits the interfaces but introduces no new structs

     - Introduce the QueryPackStore, mrvacommander/pkg/qpstore
     - Introduce the CodeQL database store, pkg/qldbstore/interfaces.go

pkg/qpstore/interfaces.go

@@ -0,0 +1,13 @@
+package qpstore
+
+import (
+	"mrvacommander/pkg/common"
+	"mrvacommander/pkg/qldbstore"
+)
+
+type Storage interface {
+	NextID() int
+	SaveQueryPack(tgz []byte, sessionID int) (storagePath string, error error)
+	FindAvailableDBs(analysisReposRequested []common.OwnerRepo) (not_found_repos []common.OwnerRepo,
+		analysisRepos *map[common.OwnerRepo]qldbstore.DBLocation)
+}