Extended Lifespan to Module classes - #100

from ellar.common import IApplicationShutdown, IApplicationStartup, Module
from ellar.core import App

@Module()
class OnStartupModule(IApplicationStartup):
    def __init__(self):
        self.on_startup_called = False

    async def on_startup(self, app: App) -> None:
        self.on_startup_called = True


@Module()
class OnShutdownModule(IApplicationShutdown):
    def __init__(self):
        self.on_shutdown_called = False

    async def on_shutdown(self) -> None:
        self.on_shutdown_called = True