net/mlx5: HWS, added tables handling

Flow tables are SW objects that are comprised of list of matchers,
that in turn define the properties of a flow to match on and set
of actions to perform on the flows in case of match hit or miss.

Reviewed-by: Itamar Gozlan <igozlan@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>