Fix bench build bug, added CI lints

[nyurik]

In order to auto-catch bugs and code quality, adding clippy and fmt to CI (same as geo)

• [x] I agree to follow the project's code of conduct.

• ~[ ] I added an entry to CHANGES.md if knowledge of this change could be valuable to users.~

[lnicola]

I still don't like clippy on CI, but oh well..

bors r+

[nyurik]

clippy makes the world a ~annoying~ fun place!

[bors[bot]]

Build succeeded:

• wkt