Broke up arcane service into separate files

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/src/providers/service/service_provider_extensions.dart

@@ -0,0 +1,51 @@
+part of "arcane_service.dart";
+
+/// An extension on `BuildContext` to provide easy access to `ArcaneService` instances
+/// that are registered in an `ArcaneServiceProvider`.
+///
+/// This extension provides methods for retrieving services in various ways.
+///
+/// Example usage:
+/// ```dart
+/// final myService = context.service<MyService>();
+/// ```
+extension ServiceProviderExtension on BuildContext {
+  /// Finds and returns the `ArcaneService` instance of type `T` that has been registered
+  /// in the `ArcaneServiceProvider` or in the list of built-in services (`Arcane.services`).
+  ///
+  /// If no such service is found, it returns `null`.
+  ///
+  /// Example:
+  /// ```dart
+  /// final myService = context.service<MyService>();
+  /// ```
+  T? service<T extends ArcaneService>() {
+    // First check built-in services
+    final builtInService = Arcane.services.whereType<T>().firstOrNull;
+    if (builtInService != null) return builtInService;
+
+    // Then check provider
+    return ArcaneServiceProvider.serviceOfType<T>(this);
+  }
+
+  /// Finds and returns the `ArcaneService` instance of type `T` that has been registered
+  /// in the `ArcaneServiceProvider` or in the list of built-in services (`Arcane.services`).
+  ///
+  /// Throws an assertion error if no service is found.
+  ///
+  /// Example:
+  /// ```dart
+  /// final myService = context.requiredService<MyService>();
+  /// ```
+  T requiredService<T extends ArcaneService>() {
+    final service = this.service<T>();
+    assert(service != null, "No service of type $T found");
+    return service!;
+  }
+
+  /// Legacy method to maintain backward compatibility.
+  ///
+  /// Prefer using `service<T>()` instead.
+  @Deprecated("Use service<T>() instead")
+  T? serviceOfType<T extends ArcaneService>() => service<T>();
+}