Add nullable annotations to Identity.Extensions

[pranavkm]

No description provided.

[pranavkm]

@HaoK / @Tratcher I'm very unfamiliar with this code, but the way I went about annotating this was looking at the results from the EF implementation and using that to model the interface. Outside of a couple of weird ones (like normalizing Id producing null because we call ToString() this seemed straightforward. Once we resolve the shape, I'll remove the NoWarn and update the PublicApi analyzer files.

[pranavkm]

Thanks! I"ll fixup the tests soonish

[luizfbicalho]

why UserName and Role.Name are Nullable? I think tha this open the model to much more problems and needs more validation

[ghost]

Hi @luizfbicalho. It looks like you just commented on a closed PR. The team will most probably miss it. If you'd like to bring something important up to their attention, consider filing a new issue and add enough details to build context.