Support injecting TableServiceClient

[martincostello]

When using TableServiceClient with .NET Aspire, the recommended approach is to configure just the URI for the table and use RBAC to configure permissions to access the table.

However if the "connection string" is just a URI, the below fails as that is not a valid connection string:

identityazuretable/src/ElCamino.AspNetCore.Identity.AzureTable/IdentityCloudContext.cs

Line 33 in f5cc8e3

_client = new TableServiceClient(config.StorageConnectionString);

.NET Aspire supports both connection strings and a service URI to create instances of TableServiceClient.

For now I've stuck with using a storage connection string to both IdentityCloudContext and .NET Aspire work together with the same configuration setting. The ideal solution would be for IdentityCloudContext to allow a way to inject a TableServiceClient (e.g. a factory delegate property on IdentityConfiguration) so that the client registered with DI by .NET Aspire can be used instead of this library creating one itself.