[PATCH v3] ethdev: add flow rule actions update API

[Ferruh Yigit]

On 5/18/2023 10:48 PM, Alexander Kozyrev wrote:
> Introduce the new rte_flow_update() API allowing users
> to update the action list in the already existing rule.

If the API is only to update actions, does make sense to rename it to
explicitly state this, like:
`rte_flow_action_update()`

Same for async version of the API.

> Flow rules can be updated now without the need to destroy
> the rule first and create a new one instead.
> A single API call ensures that no packets are lost by
> guaranteeing atomicity and flow state correctness.
> The rte_flow_async_update() is added as well.
> The matcher is not updated, only the action list is.
> 
> Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>

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