Update AspNetCore to use MetadataUpdateHandlerAttribute to clear caches

[pranavkm]

• Blazor re-rendering
• Blazor Routing
• ASP.NET Core's routing

The last two bits are currently blocked since they're treated as rude edits

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We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. Because it's not immediately obvious that this is a bug in our framework, we would like to keep this around to collect more feedback, which can later help us determine the impact of it. We will re-evaluate this issue, during our next planning meeting(s).
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[davidfowl]

I assume for routing we can trigger a change token and be done

[pranavkm]

Yup that's the plan. Routing is still a bit busted because changing custom attributes is currently treated as rude edit, but that is expected to be allowed soon-ish.

[pranavkm]

This is done. There's some additional cache clearing we need to do as part of the reloadable type effort, but that is being tracked separately.