The code quality is not as good as it could be and we have some technical debt that we should remove.

• enable easy to use cargo clippy
  • Quality of Life Improvement: cargo clippy just works #7482
• enable easy to use cargo test --workspace
  • Quality of Life Improvement: enable cargo test --workspace: via #[cfg(chv_testenv)] #7487
• tighten clippy-lints
  • base lints treewide: tighten clippy lints #7483
  • missing_const_for_fn
    • turned out to bring little benefit but is very invasive
    • might only make sense to add this to sensible fine-grained scopes
  • must_use_candidate very invasive, little benefit
  • Further useful lints
    • treewide: further tighten clippy lints  #7493
    • misc: clippy: add needless_pass_by_value #7519
• remove extern crate leftovers
  • treewide cleanup: drop extern crate, use modern rust #7501
• map_err instead of inspect_err
  • vmm: lib.rs: vmm: small code cleanups #7511
• decouple root package and workspace
  • Cargo: decouple crate from main Cargo.toml workspace #7524
  • Cargo: decouple crate from main Cargo.toml workspace #7525