Authentication/Authorization aligned with ASP.NET API

This is more of a question/feature request.

HTTP triggered Functions are great for API implementation. With the Consumption plan or client-side architected applications, HTTP triggered functions are a great choice for backend API implementation. Anyone coming from the ASP.NET API world is familiar with Authentication/Authorization concepts. Unfortunately, there's no equivalent for Azure Functions (In-Proc and Isolated SDKs). The authentication out-of-the-box is solely for Function invocation and is not related to Authentication providers. Authorization with `Authorize` attribute, supporting Roles and Policies have not equivalent whatsoever. This leads developers to re-invent the wheel and build their own AuthN/AuthZ for Functions.

It would be great if these would be provided by Functions SDK and aligned with [ASP.NET API apis](https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/authentication-and-authorization-in-aspnet-web-api).