Added

• settings_module when passed in the instance of Esmerald will take precedence
  over the global settings, removing the need of using constantly the ESMERALD_SETTINGS_MODULE.
• ApplicationSettingsMiddleware as internal that handles with the settings_module provided and maps
  the context of the settings.

Example of the way the settings are evaluated

from esmerald import Esmerald, EsmeraldAPISettings, Gateway, Include, JSONResponse, get, settings


@get()
async def home() -> JSONResponse:
    return JSONResponse({"title": settings.title})


class NewSettings(EsmeraldAPISettings):
    title: str = "Main app"


class NestedAppSettings(EsmeraldAPISettings):
    title: str = "Nested app"


app = Esmerald(
    settings_module=NewSettings,
    routes=[
        Gateway("/home", handler=home),
        Include(
            "/child",
            app=Esmerald(
                settings_module=NestedAppSettings,
                routes=[
                    Gateway("/home", handler=home),
                ],
            ),
        ),
    ],
)

In the context of the controller home, based on the path being called, it should return the
corresponding value of the title according to the settings of the app that is included.

Changed

• createapp directive views.py file generated renamed to controllers.py.
• Make the EsmeraldAPISettings hashable.
• Remove settings_config in favor of the settings_module.
• Bump Lilya version to 0.3.3.

Fixed

• Documentation references. #PR 282 by @DJWOMS