Key value store firestore - Byte store to use with Parent Document Retriever

[Freezaa9]

Implementing Firestore as a key-value store, (ByteStore)

I used Redis store as example: https://python.langchain.com/api_reference/_modules/langchain_community/storage/redis.html#RedisStore

Test include:

• ByteStore method test
• Parent document retriever test

I didn't use the function from document_converter.py and document_loader.py used in Firestorevectorstore because it made the code overcomplicate for this implementation.

Fixes #102 🦕

[averikitsch]

Thank you @Freezaa9 , we will review shortly.

[Freezaa9]

Hello, any news ?