[FEAT - UI/UX]: Lazy loading for files in subdirectories

[mihongyu]

What would you like to see?

How many documents can AnythingLLM upload to the knowledge base? At present, uploading documents requires opening the upload UI window, and the list of all documents in the library will be listed on the right side of the window. Will this list affect the speed of opening windows, assuming I have uploaded hundreds of thousands of documents into the database? Can the list on the right avoid listing all documents when opening the upload UI window? For example, instead of providing buttons to list these document lists when needed? This way, you don't have to worry about affecting the speed of opening windows, and you can focus on uploading documents.