Add .NET authentication and authorization metrics #2051
Description
- Add AuthN/AuthZ metrics dotnet/aspnetcore#59557
- [API Proposal]: AuthN/AuthZ metrics dotnet/aspnetcore#59818
- Add AuthN/AuthZ metrics to built in metrics doc dotnet/AspNetCore.Docs#35110
- Add .NET metrics #283
cc @lmolkova @MackinnonBuck @trask @JamesNK @noahfalk @open-telemetry/semconv-dotnet-approver