chore: onboard @carbon-labs/ai-chat to IBM Telemetry 🚀

[francinelucca]

Adds config required for telemetry collection to @carbon-labs/ai-chat package.

Changelog

New

• Added Telemetry disclosure to top-level README
• Added @ibm/telemetry-js dependency to @carbon-labs/ai-chat
• Added postinstall script to invoke telemetry collection
• Added telemetry.yml config file configured with npm scope.
• Included telemetry.yml in @carbon-labs/ai-chat package.json files

Changed

• N/A

Removed

• N/A

Testing / Reviewing

N/A

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