José Antonio Perdiguero

Closes #42 Closes #55 Closes #57 Closes #48 Closes #58 Closes #59 Closes #49 Closes #47 Closes #60 Closes #43 Closes #44 Closes #61 Closes #46

Integrate mypy with Flama, fix all typing errors and modify the github actions flow to include it.

Create a BackgroundTask that doesn't run in main process to avoid the issue that emerges from [encode/starlete#919](https://github.com/encode/starlette/issues/919).

Modify how Routes and Routers are initialized and how are handling the main application to allow declarative routing for all Routes types. An example of the goal syntax: ```python class...

It would be desirable to allow creating routes like this: ```python @app.get("/foo/") def foo(): return {"message": "foo"} ``` as a shortcut for: ```python @app.route("/foo/", methods=["GET"]) def foo(): return {"message": "foo"}...

It could be desirable to integrate SQLAlchemy resources (database connection and metadata) as attributes of Flama applications.

Improve the package interface by exporting the basics in main \_\_init\_\_.py

Create a modules system that allows to extend Flama's default application.