feat(http): add new middleware feature

packages/wyatt_http_client/lib/src/middleware_client.dart

@@ -33,7 +33,7 @@ class MiddlewareClient extends BaseClient {
     Client? inner,
   })  : pipeline = pipeline ?? Pipeline(),
         inner = inner ?? Client() {
-    this.pipeline.setClient(this);
+    print('Using Pipeline:\n$pipeline');
   }
 
   @override
@@ -100,27 +100,30 @@ class MiddlewareClient extends BaseClient {
         body: body,
         encoding: encoding,
       ),
-      httpRequest: Request(method, url),
-      context: MiddlewareContext(pipeline: pipeline),
     );
+    final requestContext = MiddlewareContext(
+      pipeline: pipeline,
+      client: this,
+      originalRequest: originalRequest,
+    );
+
     final modifiedRequest = await pipeline.onRequest(
+      requestContext,
       originalRequest.copyWith(),
     );
 
-    final res = await Response.fromStream(
-      await send(modifiedRequest.httpRequest),
-    );
-    final response = await pipeline.onResponse(
-      MiddlewareResponse(
-        httpResponse: res,
-        middlewareRequest: modifiedRequest,
-        context: MiddlewareContext(
-          pipeline: pipeline,
-          originalRequest: originalRequest,
-        ),
+    final originalResponse = MiddlewareResponse(
+      httpResponse: await Response.fromStream(
+        await send(modifiedRequest.request),
       ),
     );
 
-    return response.httpResponse as Response;
+    final responseContext =
+        requestContext.copyWith(originalResponse: originalResponse);
+
+    final modifiedResponse =
+        await pipeline.onResponse(responseContext, originalResponse.copyWith());
+
+    return modifiedResponse.httpResponse as Response;
   }
 }