Add Streaming API support to MVC

[pranavkm]

See previous discussions here - #4833

This depends on:

• Add support for asynchronously (de)serializing IAsyncEnumerable Developers using JsonSerializer can asynchronously (de)serialize IAsyncEnumerable<T> runtime#1570

[mkArtakMSFT]

It's not clear what's being asked here. Closing, until we have a concrete proposal here.

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.