Add TryBindConfiguration and IServiceCollection.RegisterAzureStorage overloads

[Copilot]

Adds optional-binding and direct-service-collection variants to improve flexibility in test hosts, Worker Services, and scenarios where configuration sections may be absent.

TryBindConfiguration (MDev.Dotnet.AspNetCore)

Silent no-op variants of BindConfiguration — use GetSection + Exists() instead of GetRequiredSection, so they never throw when a section is missing. Four overloads added across both IHostApplicationBuilder and IServiceCollection:

// Does not throw if "FeatureX" is absent
builder.TryBindConfiguration<FeatureXSettings>("FeatureX");
builder.TryBindConfiguration<FeatureXSettings>(out var settings, "FeatureX");

services.TryBindConfiguration<FeatureXSettings>(configuration, "FeatureX");
services.TryBindConfiguration<FeatureXSettings>(configuration, out var settings, "FeatureX");

IServiceCollection.RegisterAzureStorage (MDev.Dotnet.Azure.StorageAccount)

New IServiceCollection overload mirroring the existing RegisterCosmosDb(IServiceCollection, IConfiguration, TokenCredential) pattern. The IHostApplicationBuilder variant now delegates to it:

// Usable without IHostApplicationBuilder (test hosts, Worker Services, etc.)
services.RegisterAzureStorage(configuration, new DefaultAzureCredential());