feat: modularize external providers

Tiku.Infrastructure/Auth/NoopSmsProvider.cs

@@ -0,0 +1,14 @@
+using Tiku.Application.Auth;
+
+namespace Tiku.Infrastructure.Auth;
+
+internal sealed class NoopSmsProvider : ISmsProvider
+{
+    public Task<SmsProviderSendResult> SendAsync(
+        SmsProviderSendRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return Task.FromResult(new SmsProviderSendResult("noop", "accepted"));
+    }
+}