Add Azure App Config Aspire Client Integration

[eerhardt]

We should have an Azure App Configuration component. See https://learn.microsoft.com/azure/azure-app-configuration/quickstart-aspnet-core-app

See https://www.nuget.org/packages/Azure.Data.AppConfiguration

See also #574

[tg-msft]

I think most customers use it via https://www.nuget.org/packages/Microsoft.Extensions.Configuration.AzureAppConfiguration which might make more sense for Aspire

[davidfowl]

I think we should do this in preview4.

[DamianEdwards]

Scope creeeeeeeeeep 😉

[davidfowl]

Good thing I creeped the scope in preview1 when I snuck in the resource 😉.

[eerhardt]

Moving to preview5 as this isn't blocking preview4.