Big part of the implementation landed in Net10 preview 5 in #61609

The remaining items are

• split the implementation between different assemblies
• add e2e unit tests
• test again with aspire
• test with azure app insights
• change blazor/aspire template to contain new metrics
• add documentation [Pre5] New Blazor metrics AspNetCore.Docs#35278
• add documentation to at https://learn.microsoft.com/en-us/aspnet/core/log-mon/metrics/built-in
• add preview notes "What's new in ASP.NET Core 10.0" for .NET 10 Preview 5 AspNetCore.Docs#35473
• consider finishing Add new Blazor metrics for Net10 open-telemetry/semantic-conventions#2235
• consider API review for metric names
• consider test on metrics with EP in WASM