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PubNub memory leak detected #169

Description

@vzhurintulaco

The cause of memory leak is public class TelemetryManager : IDisposable.
This class is created by public class Pubnub is case of config.EnableTelemetry == true but will never be disposed.
It can lead to significantly increasing of Number of Active Timers and ultimately lead to memory leak.
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Also, non-disposed timers can affect monitor tools (e.g. New Relic) -
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My suggestion is:

  1. Add IDisposable interface to Pubnub class.
  2. Implement Dispose method to clear this.TelemetryManager.

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