IC files CRUD

[aliscie]

1. this function get_files should return a files tree here
   Please note: We are using this backend folder in order to connect the frontend with the backend, it can be renamed to connect_backend. The reason why we use this folder is because we have two backends 1. tauri backend (local storage) 2. ic backend (cloud storage) so we put both here as a better and scalable practice.
2. Also, we are using adjacency list data structure you can find the import file node like this use shared::schema::files::FileNode; in the ic backend. Check all the scheme here
   Note: files must have the same structure as the tauri backend
   Note: Try to run cargo tauri dev and check how the files looks like