Write tool to format `Cargo.toml`

[hackaugusto]

Often in PR reviews the following things are asked:

• sort deps alphabetically
• use { version = "1.0" }, instead of "1.0" directly
• remove unused deps

These changes can probably be automated, and then added as a cargo make rule

[hackaugusto]

Removing unused deps is harder than I thought. There seems to be a few tools to do that:

• cargo deny
  • checks licenses
  • checks vulnerability DB
• cargo udeps
  • find unused deps, but requires nightly, one build per target
• cargo machete
  • regex magic

[huitseeker]

This might help: https://github.com/lurk-lab/ci-workflows/blob/main/.github/workflows/unused-deps.yml