net/mlx5: HWS, introduce isolated matchers

In preparation for complex matcher support, introduce the isolated
matcher.

Isolated matcher is a matcher that has its own isolated table.
It is used as the second half of the complex matcher: when the rule
is split into two parts (complex rule), then matching on the first
part will send the packet to the isolated matcher that will try to
match on the second part. In case of miss, the packet goes back to
the matcher's end flow table.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Vlad Dogaru <vdogaru@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1746992290-568936-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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