[RFC] ethdev: fast path async flow API

[Dariusz Sosnowski]

Hi Ivan,

> Hi Dariusz,
> 
> I appreciate the proposal. You say that a reference PMD implementation will
> be made available for 24.03 release. What about the applications?
> Is this supposed to go to upstream code of some applications?
No source code changes are required in applications which already use async flow APIs.
API signatures are not changed in this proposal.

Only the PMD changes are required.
To be specific - callbacks for async flow APIs should not be put in rte_flow_ops,
but registered by calling rte_flow_fp_ops_register(). 

Best regards,
Dariusz Sosnowski