add framework name to mongodb driver metadata

[strogiyotec]

Hello Spring Team
MongoDB java driver team introduced a new API to MongoClient that allows users to dynamically append metadata to the driver
that later can be seen within atlas
Right now we are trying to integrate this api into all popular java frameworks that use MongoDB
For example

1. spring boot already adds metadata here when it creates MongoClient as a bean
2. we already added it to langchain4j here

In this PR , MongoClient is injected into MongoDBAtlasVectorStore and metadata about framework name is appended dynamically