Replace copyWith method with withUrl fluent API

lib/src/base_request_builder.dart

@@ -20,27 +20,7 @@ abstract class BaseRequestBuilder<T extends BaseRequestBuilder<T>> {
   /// Clones the current request builder.
   T clone();
 
-  /// Clones the current request builder using [clone] and applies the provided
-  /// parameters.
-  T copyWith({
-    RequestAdapter? requestAdapter,
-    String? urlTemplate,
-    Map<String, dynamic>? pathParameters,
-  }) {
-    final clone = this.clone();
-
-    if (requestAdapter != null) {
-      clone.requestAdapter = requestAdapter;
-    }
-
-    if (urlTemplate != null) {
-      clone.urlTemplate = urlTemplate;
-    }
-
-    if (pathParameters != null) {
-      clone.pathParameters = pathParameters;
-    }
-
-    return clone;
-  }
+  /// Clones the current request builder using [clone] and sets the given
+  /// [template] as the url template.
+  T withUrl(String template) => this.clone()..urlTemplate = template;
 }

test/request_builder_test.dart

@@ -37,20 +37,15 @@ void main() {
       {'id': '1'},
     );
 
-    final anotherRequestAdapter = MockRequestAdapter();
-
-    final newRequestBuilder = requestBuilder.copyWith(
-      requestAdapter: anotherRequestAdapter,
-      urlTemplate: 'https://graph.microsoft.com/v2.0/users/{id}',
-      pathParameters: {'id': '2'},
-    );
+    final newRequestBuilder =
+        requestBuilder.withUrl('https://graph.microsoft.com/v2.0/users/{id}');
 
     expect(newRequestBuilder.id, equals(1));
-    expect(newRequestBuilder.requestAdapter, equals(anotherRequestAdapter));
+    expect(newRequestBuilder.requestAdapter, equals(mockRequestAdapter));
     expect(
       newRequestBuilder.urlTemplate,
       equals('https://graph.microsoft.com/v2.0/users/{id}'),
     );
-    expect(newRequestBuilder.pathParameters, equals({'id': '2'}));
+    expect(newRequestBuilder.pathParameters, equals({'id': '1'}));
   });
 }