[Feature] Add integrations to allow chatting with external services i.e Google Calendar, Bing etc.

[knuurr]

Problem Description
Add support to use Chatbox interface as convenient UI for other services which could be queried via API using natural language, such as but not limited to: Google Calendar, or web search, or Jira, or any other.

Langchain supports such integrations with various platforms which allow to use natural language as a way to communicate with external services. Here is a full list.

This feature could also mirror what's already available in one commercial application I found, Alice App. I assume it works very similar to how Langchain does that: extract intent from text (i.e get my schedule for today) -> query GCalendar using integration -> analyse return data, probably in programmatic form (JSON) -> represent it to user in human-like description.

Proposed Solution
Few ideas on how could it look:

• a new plugins functionality which would allow users to create their integrations, maybe even entire flows
• a hardcoded set of chats, each with support for very specific purpose ie. one for Calendar, one for Jira, etc, just like currently there are some chats provided out of the box i.e image generation.
• perhaps, support for setting an action in text field with use of some command syntax, which could be called in all chats. Something like: @jira list my current sprint or @gcal add new appointment at 2am. That would set wanted action explicitly by user, without leaving the decision what to do to LLM.