(EAI-261) [UI] Code split UI bundle

[nlarew]

Jira

(EAI-261) [UI] Code split UI bundle

Change Notes

• Splits the UI bundle in multiple files
• Splits out the chatbot window from the ModalView component
• ModalView now lazy loads its content
• No more UMD, the UI is now ES only (sorry Chris). UMD doesn't support code splitting.
• The most interesting changes are in:
  • ChatWindow - new file, contents are ported over from ModalView
  • ModalView - now lazy loads its content (i.e. ChatWindow) only once the chatbot is opened
  • vite.config.component.ts - updated to support code splitting

• The rest of the changes are slight structural tweaks but nothing crazy

On merge, cut a new UI release for mongodb-chatbot-ui@0.7.0