fix(client): prevent client freeze when calling async from sync methods (#111)

- Added `ConfigureAwait(false)` to `await` calls in async methods to prevent deadlocks.

Author: hamzamahmood

APIMatic.Core/ApiCall.cs

@@ -102,7 +102,7 @@ public ApiCall<Request, Response, Context, ApiException, ReturnType, ResponseTyp
         public async Task<ReturnType> ExecuteAsync(CancellationToken cancellationToken = default)
         {
             requestBuilder.AcceptHeader = responseHandler.AcceptHeader;
-            CoreRequest request = await requestBuilder.Build();
+            CoreRequest request = await requestBuilder.Build().ConfigureAwait(false);
             globalConfiguration.ApiCallback?.OnBeforeHttpRequestEventHandler(request);
             _sdkLogger.LogRequest(request);
             CoreResponse response = await globalConfiguration.HttpClient.ExecuteAsync(request, cancellationToken).ConfigureAwait(false);

APIMatic.Core/Authentication/AuthGroupBuilder.cs

@@ -118,7 +118,7 @@ public override async Task Apply(RequestBuilder requestBuilder)
             Validate();
             foreach (var authManager in validatedAuthManagers)
             {
-                await authManager.Apply(requestBuilder);
+                await authManager.Apply(requestBuilder).ConfigureAwait(false);
             }
         }
     }

APIMatic.Core/Http/HttpClientWrapper.cs

@@ -74,7 +74,7 @@ public async Task<CoreResponse> ExecuteAsync(CoreRequest request, CancellationTo
             if (_overrideHttpClientConfiguration)
             {
                 responseMessage = await GetCombinedPolicy(request.RetryOption).ExecuteAsync(
-                    async (cancellation) => await ExecuteHttpRequest(request, cancellation).ConfigureAwait(false), cancellationToken)
+                    async (cancellation) => await ExecuteHttpRequest(request, cancellation).ConfigureAwait(false), cancellationToken, false)
                     .ConfigureAwait(false);
             }
             else
@@ -286,7 +286,7 @@ private AsyncRetryPolicy<HttpResponseMessage> GetRetryPolicy(RetryOption retryOp
                             GetServerWaitDuration(result).TotalMilliseconds)),
                     onRetryAsync: async (result, timespan, retryAttempt, context) =>
                     {
-                        await Task.CompletedTask;
+                        await Task.CompletedTask.ConfigureAwait(false);
                     });
 
         private AsyncTimeoutPolicy GetTimeoutPolicy()

APIMatic.Core/Request/RequestBuilder.cs

@@ -150,7 +150,7 @@ public async Task<CoreRequest> Build()
         {
             parameters.Validate().Apply(this);
             configuration.RuntimeParameters.Validate().Apply(this);
-            await authGroup.Apply(this);
+            await authGroup.Apply(this).ConfigureAwait(false);
             CoreHelper.AppendUrlWithQueryParameters(QueryUrl, queryParameters, ArraySerialization);
             body = bodyParameters.Any() ? bodyParameters : body;
             AppendContentTypeHeader();