Ellar Interceptors - #92

@injectable
class ResponseModifierInterceptor(EllarInterceptor):
    async def intercept(
        self, context: IExecutionContext, next_interceptor: t.Callable[..., t.Coroutine]
    ) -> t.Any:
        data = await next_interceptor()
        if data:
            data.update(ResponseModifierInterceptor="ResponseModifierInterceptor modified returned resulted")
        return data
        
@Controller("")
class InterceptorControllerTest(ControllerBase):
    @UseInterceptors(ResponseModifierInterceptor)
    @get("/interceptor-1")
    async def interceptor_1(self):
        return {"message": "intercepted okay"}