support ChatDurationInMinutes field for startChat request

[spencerlepine]

Issue #, if available: ⚠️ Update for: https://github.com/amazon-connect/amazon-connect-chat-ui-examples/pull/92

Description of changes: Support optional ChatDurationInMinutes passed to startChat request. Refer to public documentation: https://docs.aws.amazon.com/connect/latest/APIReference/API_StartChatContact.html#connect-StartChatContact-request-ChatDurationInMinutes

connect.ChatInterface.initiateChat({
    ...
    chatDurationInMinutes: 1500, // min 60, max 10080 - default 1500 (25 hours)
    ...
}, successHandler, failureHandler);

Checklist

• [x] update internal package [IN REVIEW]
• [x] update CFN ui-examples [IN REVIEW]

Testing

Without chatDurationInMinutes

With chatDurationInMinutes

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