Problem

This pull request resolves GitHub issue #540 by implementing a new XMPP MUC (Multi-User Chat) room information query feature. Previously, Sockethub's XMPP platform lacked the ability to query room information and features using XMPP service discovery (disco#info), which is essential for clients to understand what capabilities a room supports.

Solution

Added a new room-info verb to the XMPP platform that implements:

1. New ActivityStream Verb: Created a room-info type that follows the platform's activity stream patterns
2. Service Discovery Query: Implements XEP-0045 MUC specification using disco#info queries to retrieve room information
3. Response Handling: Processes disco#info responses and extracts room features and identity information
4. Schema Validation: Added proper schema definitions for room-info objects with features array and identity structure

Technical Changes

Core Implementation

• packages/platform-xmpp/src/index.js: Added roomInfo(job, done) method that sends disco#info queries with unique IDs
• packages/platform-xmpp/src/incoming-handlers.js: Added notifyRoomInfo(stanza) handler for processing disco#info responses
• packages/platform-xmpp/src/schema.js: Added "room-info" to allowed message types

Schema & Validation

• packages/schemas/src/helpers/objects.ts: Added complete room-info object schema with features array and identity object validation

Testing

• packages/platform-xmpp/src/incoming-handlers.test.data.js: Added realistic test data with XMPP disco#info response XML and expected ActivityStream output
• packages/platform-xmpp/src/index.test.js: Added comprehensive test coverage for the roomInfo method

Usage Example

Request:

{
  context: 'xmpp',
  type: 'room-info', 
  actor: {
    id: '[email protected]/pidgin',
    type: 'person'
  },
  target: {
    id: '[email protected]',
    type: 'room'
  }
}

Response:

{
  context: 'xmpp',
  type: 'room-info',
  actor: {
    id: '[email protected]', 
    type: 'room',
    name: 'Room Display Name'
  },
  target: {
    id: '[email protected]/pidgin',
    type: 'person'
  },
  object: {
    type: 'room-info',
    features: ['http://jabber.org/protocol/muc', 'muc_passwordprotected'],
    identity: {
      category: 'conference',
      type: 'text', 
      name: 'Room Display Name'
    }
  }
}

Testing

All 49 tests pass, including new tests specifically for:

• Service discovery query generation with unique IDs
• Disco#info response parsing and ActivityStream conversion
• Schema validation for room-info objects

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