lifespan events in sub-applications

Hi. I was wondering if sub-applications (mounted on the main application) should receive startup/shutdown events and call their own handlers. I saw it is not the case at the moment. Should we document it or implement the dispatching of lifespan events ?

[!IMPORTANT]

• We're using Polar.sh so you can upvote and help fund this issue.
• We receive the funding once the issue is completed & confirmed by you.
• Thank you in advance for helping prioritize & fund our backlog.