♻️ 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}}/backend/app/scripts/lint.sh

@@ -2,7 +2,8 @@
 
 set -x
 
-autoflake --remove-all-unused-imports --recursive --remove-unused-variables --in-place app --exclude=__init__.py
-isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --combine-as --line-width 88 --recursive --apply app
-black app
+mypy app
+black app --check
+isort --recursive --check-only app
 vulture app --min-confidence 70
+flake8