Implement filelock for db_path when using the chroma server

[Davidyz]

This PR attempts to introduce file locks that will allow using the bundled chroma server with the LSP and MCP servers.

This will also implement some helper classes/functions that simplify the management of chroma clients in case different projects are configured to use different chroma servers.

PS: @rieger-jared, it's likely that this PR will be overlapping with some of the stuff that you're working on in #165. I'm not too worried about this, though, because this is only about the bundled chromadb server, and we probably won't be bundling a bunch of database servers in the vectorcode package?

[rieger-jared]

This PR attempts to introduce file locks that will allow using the bundled chroma server with the LSP and MCP servers.

This will also implement some helper classes/functions that simplify the management of chroma clients in case different projects are configured to use different chroma servers.

PS: @rieger-jared, it's likely that this PR will be overlapping with some of the stuff that you're working on in #165. I'm not too worried about this, though, because this is only about the bundled chromadb server, and we probably won't be bundling a bunch of database servers in the vectorcode package?

Thanks for the heads up. I think I'll let you finish this one before continuing as the client manager looks similar to something I was doing. Plus I think I need to spend a little more time evaluating the langchain integration as it seems that using langchain might require changing the way we handle documents as the vector store abstraction in the library expects the documents(60% sure of that).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.75%. Comparing base (1d71b93) to head (cb5160a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   99.49%   99.75%   +0.25%     
==========================================
  Files          21       21              
  Lines        1589     1627      +38     
==========================================
+ Hits         1581     1623      +42     
+ Misses          8        4       -4     

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