feat: migrate QueueITLib to Swift

- Modified .gitignore and Package.swift
- Deleted old Objective-C files from QueueITLib
- Added new Swift files to Sources/QueueITLib

Author: alexanderthoren

.gitignore

@@ -6,4 +6,5 @@ xcuserdata/
 /.idea
 build
 QueueITLibSwift.xcframework.zip
-.DS_Store
+.DS_Store
+.index-build

Package.swift

@@ -6,18 +6,18 @@ import PackageDescription
 let package = Package(
     name: "QueueITLibrary",
     platforms: [
-        .iOS(.v11)
+        .iOS(.v11),
     ],
     products: [
         .library(
             name: "QueueITLibrary",
-            targets: ["QueueITLibrary"]),
+            targets: ["QueueITLibrary"]
+        ),
     ],
     targets: [
         .target(
             name: "QueueITLibrary",
-            path: "QueueItLib/",
-            publicHeadersPath: ""
-        )
+            path: "Sources/QueueITLib"
+        ),
     ]
 )