[EUX-1843] Document chat lifecycle hub, matrix, samples, and gateway/API touchpoints

[raymondjoneskustomer]

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[EUX-1843] Chat Lifecycle documentation: CHAT_CONNECTIONS hub updates, cross-platform matrix sample-app links, sample READMEs, and related repo docs. Tracked in Linear.

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Below is a concise technical summary of the changes proposed in this PR:
Describe the new Chat Lifecycle hub entry, linking the CocoaPods distribution info, runtime behavior, and PubNub topology to the relevant repositories for the iOS chat SDK. Highlight the related chat-api documentation sections and the primary CocoaPods and SDK references for easy access.

Latest Contributors(2)

User	Commit	Date
raymond.jones@kustomer...	update readme to inclu...	October 02, 2024
david@kustomer.com	update readme	September 20, 2023

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• README.md

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