feat: search & vector stores impl

[mikeee]

Description

Issue reference

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

❌ Patch coverage is 84.87805% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.46%. Comparing base (c9af9fd) to head (faae803).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
client/vector.go	83.65%	18 Missing and 16 partials ⚠️
client/search.go	86.13%	14 Missing and 14 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #838      +/-   ##
==========================================
+ Coverage   56.73%   59.46%   +2.72%     
==========================================
  Files          52       54       +2     
  Lines        3784     4194     +410     
==========================================
+ Hits         2147     2494     +347     
- Misses       1482     1515      +33     
- Partials      155      185      +30     

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