Add Blazor enhanced nav events

[guardrex]

Fixes #34086
Addresses #31909

Per dotnet/aspnetcore#58630.

They seem straightforward enough. I didn't see tests for the new events in the framework. Do you have any specific example(s) that you'd like to show for them?

Also, I'm not sure if using the word "load" in the way that I have for the description is correct for enhancedload. 👀

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[MackinnonBuck]

Sorry, I should have commented first, then approved. My bad!

[MackinnonBuck]

They seem straightforward enough. I didn't see tests for the new events in the framework. Do you have any specific example(s) that you'd like to show for them?

Not in particular - I think it's enough to call out that they exist. I actually added them because we had a need for them in the framework itself.

[guardrex]

I'll submit a patch, but I'm on the treadmill running off a lot of 🦃🦃🦃🦃😆. I'll update this by EOD before it goes live.

UPDATE: Patched on #34262.