Feature: Implemented Famcache Publish/Subscribe protocol

[hchristine]

Famcache Publish/Subscribe protocol implementation

Details

To publish a new event to the famcache server

client.publish('topic', 'data');

To Subscribe to the topic

client.subscribe('topic', (data) => {
  // ...
});

To unsubscribe from the topic

client.unsubscribe('topic');

[shahen94]

🎉 This PR is included in version 1.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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