net: fib_rules: Add port mask support

Add support for configuring and deleting rules that match on source and
destination ports using a mask as well as support for dumping such rules
to user space.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250217134109.311176-3-idosch@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>