INTG: Slack / Team integrations

[cwang]

Is your feature request related to a problem? Please describe.

An alternative to the built-in chat interface, integrations with Slack and Team would allow more convenient access.

Describe the solution you'd like

Could be piggy-backed to https://github.com/docqai/docq/issues/22 or build something before the AI support is in place.

Describe alternatives you've considered

See the suggested solution above for a plugin-based alternative. If time is of the essence then we should probably go for it without waiting for the plugin system to be ready.

Additional context

Customer validation first!!