[AltServer] Adds ALTDebugConnection to “debug” sideloaded apps

Allows AltServer to programmatically enable JIT execution in sideloaded apps.

AltServer/Connections/ALTDebugConnection+Private.h

@@ -0,0 +1,28 @@
+//
+//  ALTDebugConnection+Private.h
+//  AltServer
+//
+//  Created by Riley Testut on 2/19/21.
+//  Copyright © 2021 Riley Testut. All rights reserved.
+//
+
+#import "ALTDebugConnection.h"
+
+#include <libimobiledevice/libimobiledevice.h>
+#include <libimobiledevice/debugserver.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface ALTDebugConnection ()
+
+@property (nonatomic, readonly) dispatch_queue_t connectionQueue;
+
+@property (nonatomic, nullable) debugserver_client_t client;
+
+- (instancetype)initWithDevice:(ALTDevice *)device;
+
+- (void)connectWithCompletionHandler:(void (^)(BOOL success, NSError *_Nullable error))completionHandler;
+
+@end
+
+NS_ASSUME_NONNULL_END