Add userpresence

[marcduiker]

Description

This feature introduces the back-end implementation for a online/offline indicator for a user profile.

1. UserPresenceService publishes a UserPresenceMessage message to the user-presence-<userId> Ably channel.
2. A Reactor event is configured that triggers on user-presence-* channels and calls the api/presence-update function.
3. The api/presence-update HTTPTrigger function:
   • Updates the User profile (via UserService).
   • Gets the channels the user is part of (via ChannelService).
   • Updates the onlineCount for the relevant channels.
4. The event-integrations/presence-publish TimerTrigger function:
   • Get's all the channels
   • Publishes a ChannelPresenceMessage[] to the utility-channel Ably channel.

I duplicated some code from api/common to event-integrations/common since the latter now reads from CosmosDB.

Not done yet:

• Call UserPresenceService when users logs on/off.
• Adding all users to the utility-channel, subscribing to the channel-presence messages and handling the receiving these messages (updating the UI).

PR Checklist

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• No linting errors/warnings are introduced.
• Unit tests are all passing.
• The feature/fix has been tested locally.
• The feature/fix satisfies the acceptance criteria described in issue: #.

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