fix: improve Rust quality and expose more things through Adaptors

[reneca]

No description provided.

[oschijns]

New suggestion:
add a file rustfmt.toml or .rustfmt.toml with the following content

max_width = 140

And reformat the whole project

cargo fmt

Some expressions will no longer be split over multiple lines which it will make them easier to read.

[reneca]

I’m not sure if a 140-character line width is ideal, especially on smaller screens where it might make reading more difficult.
However, what do you think about using use_small_heuristics = "Max" ?

It compresses many lines (without increasing the max width) and still feels quite clear to me.