♻️ Refactor backend, settings, DB sessions, types, configs, plugins (#158)

* ♻️ Refactor backend, update DB session handling

* ✨ Add mypy config and plugins

* ➕ Use Python-jose instead of PyJWT

as it has some extra functionalities and features

* ✨ Add/update scripts for test, lint, format

* 🔧 Update lint and format configs

* 🎨 Update import format, comments, and types

* 🎨 Add types to config

* ✨ Add types for all the code, and small fixes

* 🎨 Use global imports to simplify exploring with Jupyter

* ♻️ Import schemas and models, instead of each class

* 🚚 Rename db_session to db for simplicity

* 📌 Update dependencies installation for testing

{{cookiecutter.project_slug}}/docker-compose.override.yml

@@ -37,7 +37,8 @@ services:
       context: ./backend
       dockerfile: backend.dockerfile
       args:
-        env: dev
+        INSTALL_DEV: ${INSTALL_DEV-true}
+        INSTALL_JUPYTER: ${INSTALL_JUPYTER-true}
     # command: bash -c "while true; do sleep 1; done"  # Infinite loop to keep container live doing nothing
     command: /start-reload.sh
     labels:
@@ -57,7 +58,8 @@ services:
       context: ./backend
       dockerfile: celeryworker.dockerfile
       args:
-        env: dev
+        INSTALL_DEV: ${INSTALL_DEV-true}
+        INSTALL_JUPYTER: ${INSTALL_JUPYTER-true}
 
   frontend:
     build: