LLPhant is one of the most popular AI framework in PHP 

However, it doesn't support MongoDB as a vector store for embeddings out of the box.

Expected:

• Add MongoDB as a supported Vector Store -
  • https://github.com/LLPhant/LLPhant/tree/main/src/Embeddings/VectorStores 
• Update documentation
  • https://github.com/LLPhant/LLPhant/tree/main?tab=readme-ov-file#vectorstores 
• Create a tutorial

PR 1/2: https://github.com/LLPhant/LLPhant/pull/439

I want to open a second one for the ODM since there's also an ORM store.