fix(BingAIClient): switch to nodejs-gpt for latest community updates

[danny-avila]

Summary

Removes @waylaidwanderer/chatgpt-api in favor of latest community updates to nodejs-gpt: https://github.com/danny-avila/nodejs-gpt

Fixes #1022 by pulling in encryptedConversationSignature support

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

It just works

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules.