feat: add Google Vertex AI Vector Search support to vector store factory (#5791)

Co-authored-by: kartik-mem0 <kartik.labhshetwar@mem0.ai>
Co-authored-by: divyansh-1009 <divyansh-1009@users.noreply.github.com>

mem0-ts/package.json

@@ -112,6 +112,7 @@
     "@azure/identity": "^4.0.0",
     "@azure/search-documents": "^12.0.0",
     "@cloudflare/workers-types": "^4.20250504.0",
+    "@google-cloud/aiplatform": "^6.8.0",
     "@google/genai": "^1.40.0",
     "@langchain/core": "^1.1.47",
     "@mistralai/mistralai": "^1.5.2",