✨ Introduce hook points for the PriorityQueue

[matheuscscp]

This change introduces an interface defining hook points for the PriorityQueue. This helps enabling advanced use cases where reacting to internal events of the priority queue may be necessary, like the first hook point being introduced: OnBecameReady.

OnBecameReady is called when items become ready for consumption, i.e. can be handed to GetWithPriority calls.

Closes: #3334

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: matheuscscp / name: Matheus Pimenta (cc01508)

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