feat: add some api packages

internal/api/grpc/header.go

@@ -0,0 +1,21 @@
+package grpc
+
+import (
+	"context"
+
+	"github.com/grpc-ecosystem/go-grpc-middleware/util/metautils"
+)
+
+const (
+	Authorization = "authorization"
+
+	ZitadelOrgID = "x-zitadel-orgid"
+)
+
+func GetHeader(ctx context.Context, headername string) string {
+	return metautils.ExtractIncoming(ctx).Get(headername)
+}
+
+func GetAuthorizationHeader(ctx context.Context) string {
+	return GetHeader(ctx, Authorization)
+}