API proposal for Blazor metrics extensions

[javiercn]

+++ b/src/Components/Components/src/PublicAPI.Unshipped.txt
+Microsoft.AspNetCore.Components.Infrastructure.ComponentsMetricsServiceCollectionExtensions
+static Microsoft.AspNetCore.Components.Infrastructure.ComponentsMetricsServiceCollectionExtensi
ons.AddComponentsMetrics(Microsoft.Extensions.DependencyInjection.IServiceCollection! services)
-> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static Microsoft.AspNetCore.Components.Infrastructure.ComponentsMetricsServiceCollectionExtensi
ons.AddComponentsTracing(Microsoft.Extensions.DependencyInjection.IServiceCollection! services)
-> Microsoft.Extensions.DependencyInjection.IServiceCollection!

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