Mongodb integration as vectorstore

[dartpain]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

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• Other information:

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[codecov]

Codecov Report

Attention: 59 lines in your changes are missing coverage. Please review.

Comparison is base (fd8b7aa) 19.56% compared to head (a3e6239) 19.35%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
application/vectorstore/mongodb.py	15.78%	48 Missing ⚠️
application/llm/openai.py	30.00%	7 Missing ⚠️
application/vectorstore/document_class.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #822      +/-   ##
==========================================
- Coverage   19.56%   19.35%   -0.21%     
==========================================
  Files          62       64       +2     
  Lines        2914     2971      +57     
==========================================
+ Hits          570      575       +5     
- Misses       2344     2396      +52     

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