feat: in-app dismiss message

[ami-aman]

closes https://github.com/customerio/issues/issues/9930

PR for in-app dismiss message. Import CioMessagingInApp and call the method MessagingInApp.shared.dismissMessage() to dismiss active in-app message shown on the screen.

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[github-actions]

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Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• CocoaPods-FCM: aman/in-app-dismiss-message (1684751194)
• APN-UIKit: aman/in-app-dismiss-message (1684751232)

[levibostian]

Because the PR implementation doesn't align with the design of the feature, I will request changes for now.