refactor(internal): export internal packages (#887)

* refactor: export internal packages

* refactor(server): define Server

* refactor: fix lint issues

* test(integration): fix imports

pkg/commands/operation/inject.go

@@ -0,0 +1,13 @@
+// +build wireinject
+
+package operation
+
+import (
+	"github.com/aquasecurity/trivy/pkg/db"
+	"github.com/google/wire"
+)
+
+func initializeDBClient(cacheDir string, quiet bool) db.Client {
+	wire.Build(db.SuperSet)
+	return db.Client{}
+}