Sunshine API endpoints for managing connected clients

[User-green]

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Feature Request

Body

I propose adding following API endpoints:

GET /api/connections
Returns list of all currently connected clients as list of s.

GET /api/connections/{id}
Returns data on certain connection. Returns:

• time elapsed since connected
• time elapsed since last active
• source ip
• destanation ip
• client public key

DELETE /api/connections/{id}
Requires:

• apikey
• Kill or detach? (true/false)
• Execute revert command? (true/false)
  Kills selected connection.

Admin password can be temporary used as apikey - untill proper apikey system created.

[User-green]

This will be useful for a number of reasons. Primary one - this will allow monitor switching scripts much finer control. Secondary one - if someone does something unauthorized, this API will allow to rapidly and automatically block them from assessing the system.