add prelude to rocket

[gabriel123495]

API Docs to Existing Functionality

https://api.rocket.rs/v0.5/rocket/struct.Rocket

Problems with Existing Functionality

rocket has so many modules like jsons and cookies that i forget to include all, adding use rocket::prelude::*; would help so much to didn't forgetting everything

Suggested Changes

just the way you import rocket modules

Alternatives Considered

none

Additional Context

No response

System Checks

• I do not believe that this suggestion can or should be implemented outside of Rocket.

• I was unable to find a previous suggestion for this change.

[pranavmanglik]

I have tried acting on what you were suggesting, will be happy to
work on it further if needed.