Enable more clippy lints for automated code review

[mara-schulke]

https://rust-lang.github.io/rust-clippy/master/index.html#/import?groups=cargo,complexity,correctness,deprecated,nursery,pedantic,perf,restriction,style,suspicious

[tomkarw]

Let me introduce you to a comprehensive list of optional clippy lints :P

However, I dislike the fact that optional lints used to pollute source files. Starting from 1.74.0 there is a way to specify them in Cargo.toml, we should use that.