Use operation hooks instead of deprecated model hooks

See the discussion in #824. We were not able to remove deprecated model hooks because embedded relations are still relying on them.

There is a feature for inst.triggerParent in embedsMany that needs more consideration and possibly a rewrite for embedded relations to continue work. It is for updating the parent model if any changes are made to the relation. This part needs a redesign and rewrite to consider the different cases and to make it all consistent.

We should rewrite inst.triggerParent to not depend on deprecated hooks, for example using the approach outlined in https://github.com/strongloop/loopback-datasource-juggler/commit/d0cc791bc65e5ee7d2447698539da1d1ca0591ee

cc @jannyHou @Amir-61 @superkhau

#824 の議論から始め、inst.triggerParent 周辺の埋め込みリレーションのパスを調査してください。現在の動作を commit d0cc791bc65e5ee7d2447698539da1d1ca0591ee のアプローチと比較してください。埋め込みリレーションが deprecated な model hooks に依存せず、引き続き一貫して親を更新できれば完了です。