NSURLSession rewrite (#422)

* clang-format: Do not use tabs

* Ignore clangd cache and compile_commands

* NSBlockOperation: Fix memory leak

* NSHTTPCookie: Fix expires date parsing

* NSHTTPCookie: Release DateFormatter after use

* NSOperation: Remove all objects at end of execution

* Reimplementation of NSURLSession

* NSURLSession: Update expiration dates in test

* Update ChangeLog

* Fix trivial compiler warning caused by missing import

* Import GSDispatch.h for definition of DISPATCH_QUEUE_SERIAL

* Import common.h early to avoid header conflict

* Fix import order to avoid conflicts and ensure we have correct localisation macro

* Check for presence of dispatch_cancel

* Cancel timer using dispatch_source_cancel() if dispatch_cancel() is missing.

* NSURLSession: Replace dispatch_io with dispatch_source in unit test HTTP server

---------

Co-authored-by: hmelder <service@hugomelder.com>

Headers/Foundation/NSURLRequest.h

@@ -271,6 +271,16 @@ GS_EXPORT_CLASS
  */
 - (NSString *) valueForHTTPHeaderField: (NSString *)field;
 
+#if OS_API_VERSION(MAC_OS_VERSION_11_0, GS_API_LATEST)
+/**
+ * Indicates whether the URL loading system assumes the host is HTTP/3 capable.
+ *
+ * This method returns the current assumption of the URL loading system regarding
+ * the server's HTTP capabilities.
+ */
+- (BOOL) assumesHTTP3Capable;
+#endif
+
 @end
 
 
@@ -327,6 +337,17 @@ GS_EXPORT_CLASS
  */
 - (void) setValue: (NSString *)value forHTTPHeaderField: (NSString *)field;
 
+#if OS_API_VERSION(MAC_OS_VERSION_11_0, GS_API_LATEST)
+/**
+ * Sets whether the URL loading system should assume the host is HTTP/3 capable.
+ *
+ * This method configures the URL loading system's assumptions about the
+ * server's HTTP capabilities, optimizing the connection process if HTTP/3 is
+ * supported.
+ */
+- (void) setAssumesHTTP3Capable: (BOOL)capable;
+#endif
+
 @end
 
 @protocol GSLogDelegate;