refactor: add ClockModule in Fitnet common clock

A new file named ClockModule.cs has been added within the Fitnet common clock namespace and a method called AddClock is established. The method, taking the IServiceCollection services as a parameter, returns the Singleton of the TimeProvider System. In addition, the TimeProvider instance injection in Program.cs has been replaced by AddClock().

Author: kamilbaczek

Chapter-1-initial-architecture/Src/Fitnet/Common/Clock/ClockModule.cs

@@ -0,0 +1,7 @@
+namespace EvolutionaryArchitecture.Fitnet.Common.Clock;
+
+internal static class ClockModule
+{
+    internal static IServiceCollection AddClock(this IServiceCollection services) =>
+        services.AddSingleton(TimeProvider.System);
+}

Chapter-1-initial-architecture/Src/Fitnet/Program.cs

@@ -1,3 +1,4 @@
+using EvolutionaryArchitecture.Fitnet.Common.Clock;
 using EvolutionaryArchitecture.Fitnet.Common.ErrorHandling;
 using EvolutionaryArchitecture.Fitnet.Common.Events.EventBus;
 using EvolutionaryArchitecture.Fitnet.Common.Validation.Requests;
@@ -13,7 +14,7 @@
 builder.Services.AddSwaggerGen();
 builder.Services.AddEventBus();
 builder.Services.AddRequestsValidations();
-builder.Services.AddSingleton(TimeProvider.System);
+builder.Services.AddClock();
 
 builder.Services.AddPasses(builder.Configuration);
 builder.Services.AddContracts(builder.Configuration);