[AltJIT] Adds AltJIT CLI tool to enable JIT on devices running iOS 17+

Commands:

altjit enable [app/pid] --udid [udid]
* Enables JIT for given app/process

altjit mount --udid [udid]
* Mounts personalized developer disk

Shared/Types/AppProcess.swift

@@ -0,0 +1,35 @@
+//
+//  AppProcess.swift
+//  AltStore
+//
+//  Created by Riley Testut on 9/6/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+enum AppProcess: CustomStringConvertible
+{
+    case name(String)
+    case pid(Int)
+    
+    var description: String {
+        switch self
+        {
+        case .name(let name): return name
+        case .pid(let pid): return "Process \(pid)"
+        }
+    }
+    
+    init(_ value: String)
+    {
+        if let pid = Int(value)
+        {
+            self = .pid(pid)
+        }
+        else
+        {
+            self = .name(value)
+        }
+    }
+}