Add AccessControl support to KeychainSwift

[ba-amin]

No description provided.

[ba-amin]

Hello,
In this PR, KeyhainSwift now support SecAccessControlCreateFlags, which is described here.
A best practice of this feature is described

Best Practice: Apple recommends using this feature to securely store items in the keychain and ensure they are only accessible when the user is present. Detailed guidance can be found here in Apple documentation.

Summary

• ✅ Tests wrote for this added feature and all tests passed.
• ✅ In Demo application (for iOS) some changes happen to optionally use this feature. (using a UISwitch)

I have personally used this feature in various projects for years and thought it would be beneficial to contribute it here. I hope you find this addition useful and valuable for the community. ❤️

[evgenyneu]

Thanks for your work, but I'm not accepting new features.