Add support for auth_tokens in boot and update methods

[nhibberd]

Users can now pass authentication tokens to Intercom for secure data operations. The authTokens property accepts an object with any string key-value pairs.

Example usage: boot({ email: '[email protected]', userId: '9876', authTokens: { security_token: 'abc...' // JWT } })

🤖 Generated with Claude Code

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 7ff5a4e28ae7b051e602e3aa3124d1927f471c93

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
react-use-intercom	Minor

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[kane-chang]

@nhibberd hello! I'm currently facing this limitation with auth_tokens, will this PR be continued? 🙏