Added ultra-wide camera feature and switching between the lenses (1x to 0.5x)

[das-anubhav]

Types of changes

• Added enumeration definition named uWide in CameraManager.swift
• Added AVCaptureDevice for .builtInUltraWideCamera
• Added UILabel named Lens Label for switching between 1x to 0.5x lens in Main.storyboard
• Added lensLabel as UILabel with user Interaction and created changeCameraLens() func in ViewController.swift

Issues Solved

• #257
• #254