Feature request: Migrate Intercom Identity Verification to JWTs

[eredi93]

Identity Verification is now deprecated:
https://www.intercom.com/help/en/articles/183-set-up-identity-verification-for-web-and-mobile-deprecated

Users are now authenticated using JWT:
https://www.intercom.com/help/en/articles/10589769-authenticating-users-in-the-messenger-with-json-web-tokens-jwts

The change should be as simple as updating the key from payload.user_hash to payload.intercom_user_jwt

rudder-sdk-js/packages/analytics-js-integrations/src/integrations/INTERCOM/utils.js

Line 12 in 9a294c9

payload.user_hash = userHash;

Opening this issue to get your thoughts before I put together a pull request

[contributor-support]

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