[FEATURE] Intercom - New Conversation Rating Added

[andrewjschuang]

Intercom - New Conversation Rating Added
Add an optional prop to only emit events for new conversations, e.g. not just new conversation ratings, but the conversation created timestamp has to also be greater than the trigger creation timestamp

Additional context
Priority request

[vunguyenhung]

Hi everyone, all test cases are passed! Ready for release!

Test report
https://vunguyenhung.notion.site/FEATURE-Intercom-New-Conversation-Rating-Added-232bf548bb5e816798ecc1b1db064ffe