To support configuring providers directly from IConfiguration (eg, emitted by Aspire), we scan for [RegisterProvider(...)] attributes in all assemblies. This should be done via code generation instead. i.e, we should create a list of the known providers in generated metadata instead of needing to perform assembly scanning and reflection.

Here are some relevant code references:

Scanning on the client:

Scanning on the silo:

The RegisterProviderAttribute definition:

TypeManifestOptions:

MetadataGenerator:
https://github.com/dotnet/orleans/blob/f23233a70dd3c4d5f216c7be2aa2ed8faca7a58a/src/Orleans.CodeGenerator/MetadataGenerator.cs