[push-notifications] Notification Sender side

[berendsliedrecht]

In order for this plugin to be complete, we have to implement the notitifcation sender side.

This means:

• Listening to new incoming messages via the correct URI
• Adding the incoming message payload to the connection metadata

[atb-sweta]

@blu3beri Is this already implemented?
I am trying to implement push notifications. I did all the steps on the receiver side : https://github.com/hyperledger/aries-framework-javascript-ext/tree/main/packages/push-notifications

But not able to receive notifications.
What changes need to be done on the Sender side?

[icc-romeu]

Hi, I ended implementing this myself. Maybe this is helpful to someone: #278 (comment)