Add VLite Vectorstore to Langchain

[lrafeei]

This PR adds the VLite Vectorstore to Langchain

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	2		0	5.59s
✅ PYTHON	black	2	0	0	1.8s
✅ PYTHON	flake8	2		0	0.93s
✅ PYTHON	isort	2	0	0	0.35s
✅ PYTHON	pylint	2		0	6.87s

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.73%. Comparing base (d9dcfaa) to head (e908c37).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1131      +/-   ##
==========================================
- Coverage   81.76%   81.73%   -0.03%     
==========================================
  Files         192      192              
  Lines       21300    21301       +1     
  Branches     3706     3706              
==========================================
- Hits        17415    17410       -5     
- Misses       2812     2814       +2     
- Partials     1073     1077       +4     

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