Implement PineconeVectorStore

[philippjfr]

So far we've largely relied on local vector stores but for production usecases there are various vector store providers. The one I've seen used with several clients of ours is Pinecone so I drafted a little implementation. Needs more testing and is only a draft for now.

[codecov]

Codecov Report

❌ Patch coverage is 15.50000% with 169 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.98%. Comparing base (13ef1ad) to head (bad800d).

Files with missing lines	Patch %	Lines
lumen/ai/vector_store.py	15.50%	169 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1628      +/-   ##
==========================================
- Coverage   67.39%   66.98%   -0.41%     
==========================================
  Files         152      152              
  Lines       25365    25565     +200     
==========================================
+ Hits        17094    17125      +31     
- Misses       8271     8440     +169     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.