[SDK-1675] Release iOS Push Templates

[nishant-clevertap]

• New templates added: Basic, Auto carousel, Manual carousel, Timer.
• Backward compatibility for single media and content slider.
• New templates have support for adding text color, background color.
• Added support for handling invalid image url, the template will fall back to basic iOS push alert if any image can't be downloaded.
• Added all templates file changes in Swift, created local xcframework to support SPM compatibility.
• Updated example applications to send push from campaigns with button click.

[akashvercetti]

In the changelog, please add compatibility with CleverTap iOS SDK 4.1.0