Extending fuzzing of the code base

Rust Version

stable

Diesel Version

main

Diesel Features

not relevant

Database Version

not relevant

Operating System Version

not relevant

What happened?

With https://github.com/diesel-rs/diesel/pull/5212 we have a working fuzzing setup for the type deserialization layer. We would like to extend the fuzzing coverage to other parts of the code base.

Checklist

• I have already looked over the issue tracker and the discussion forum for similar possible closed issues.

• This issue can be reproduced on Rust's stable channel. (Please submit the issue in the Rust issue tracker instead if that's not the case)

• This issue can be reproduced without requiring a third party crate