tools: ynl: rework policy access to support recursion

Donald points out that the current naive implementation using dicts
breaks if policy is recursive (child nest uses policy idx already
used by its parent).

Lean more into the NlPolicy class. This lets us "render" the policy
on demand, when user accesses it. If someone wants to do an infinite
walk that's on them :) Show policy info as attributes of the class
and use dict format to descend into sub-policies for extra neatness.

Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20260313232047.2068518-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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