Blazor Hybrid routing and nav topic

[guardrex]

Addresses #24956

Internal Review Topic

Notes

• These will be rough at first. I'll circle around later for niceties like API doc cross-links (when available), enhanced descriptions, fully-working, cut-'n-paste code examples, etc.
• Although this PR doesn't include routing coverage, I think we'll probably be adding at least a brief remark that component routing (in a BlazorWebView) conforms to the coverage in the Blazor Fundamentals node topic on the subject with any caveats or gotchas 😈 that you want to call out. Fundamentals topic on routing/nav ... Does it all apply to Hybrid scenarios (BlazorWebView)?

[TanayParikh]

Thanks @guardrex. I'm going to hold off on reviewing till the original PR is merged, just in case there are minor changes like renaming the enum value.

cross linking dotnet/maui#4645

[TanayParikh]

LGTM other than one minor formatting change. Thanks!