Python compatibility of SimpleVectorStore

[omonnin-ynov]

It's pretty much all in the title.

I was trying to import a simple vector store, index store and document store, and it kept crashing as it was loading.

Turns out, the TS library expects the JSON variables in camelCase and not snake_case. I believe the TS library should use the same naming convention as the Python one for compatibility purposes.

Godspeed.

[marcusschiesser]

as @omonnin-ynov points out, SimpleVectorStore is not compatible between Python and TS versions. This ticket is to fix this