[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/Errors/JITError.swift

@@ -0,0 +1,52 @@
+//
+//  JITError.swift
+//  AltJIT
+//
+//  Created by Riley Testut on 9/3/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+extension JITError
+{
+    enum Code: Int, ALTErrorCode
+    {
+        typealias Error = JITError
+        
+        case processNotRunning
+    }
+    
+    static func processNotRunning(_ process: AppProcess, file: StaticString = #file, line: Int = #line) -> JITError {
+        JITError(code: .processNotRunning, process: process, sourceFile: file, sourceLine: UInt(line))
+    }
+}
+
+struct JITError: ALTLocalizedError
+{
+    let code: Code
+    
+    var errorTitle: String?
+    var errorFailure: String?
+    
+    @UserInfoValue var process: AppProcess?
+    
+    var sourceFile: StaticString?
+    var sourceLine: UInt?
+    
+    var errorFailureReason: String {
+        switch self.code
+        {
+        case .processNotRunning:
+            let targetName = self.process?.description ?? NSLocalizedString("The target app", comment: "")
+            return String(format: NSLocalizedString("%@ is not running.", comment: ""), targetName)
+        }
+    }
+    
+    var recoverySuggestion: String? {
+        switch self.code
+        {
+        case .processNotRunning: return NSLocalizedString("Make sure the app is running in the foreground on your device then try again.", comment: "")
+        }
+    }
+}