feat: block overwriting alokai metadata (#7300)

* feat: block overwriting alokai metadata

* refactor: outsourced deep merging of obj's to lodash.merge

* feat: guard to prevent overwriting alokai key in metadata obj

* fix: tests

* Update packages/middleware/src/logger/injectMetadata.ts

Co-authored-by: Bartosz Herba <[email protected]>

---------

Co-authored-by: Bartosz Herba <[email protected]>

Author: Fifciu

.changeset/blue-suits-drop.md

@@ -0,0 +1,5 @@
+---
+"@vue-storefront/middleware": minor
+---
+
+block overwriting alokai metadata