fix: async shutdown handler not getting called

[VishnuSanal]

Description

This PR fixes #964

Summary

This PR does fix async shutdown handler not getting called

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[vercel]

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[codspeed-hq]

CodSpeed Performance Report

Merging #965 will not alter performance

_{Comparing VishnuSanal:fix-shutdown-handler (8dcae24) with main (028f161)}

Summary

✅ 116 untouched benchmarks

[VishnuSanal]

note to self: Sanskar taking this over after discussion in the meeting. :)

[VishnuSanal]

• fix crash event loop already runnign

[VishnuSanal]

current issues:

• have to press ctrl + c twice for an app with async shutdown handler to quit when running as cli
• dev server doesn't get terminated properly -- the post is occupied the next time the app runs (when using with async shutdown handler)

[sansyrox]

Hey @VishnuSanal ,

There are some conflicts. Can you have a look again?

[VishnuSanal]

@sansyrox PTAL