chore: clean up dead code and deps

[benluelo]

• use dep = { workspace = true } instead of dep.workspace = true and reformatted some Cargo.toml files to be more consistent with the style used throughout the repo
• move some more deps to workspace deps
• remove dead voyager plugin data.rs/callback.rs files and use Never instead
• remove some unused deps from some crates with cargo-machete and unused_crate_dependencies
  • note that both are imperfect and have many false positives/negatives, so i only ran it manually locally and did not make a CI check for this

leaner deps means we get faster build times and better caching in CI, as packages depend on a smaller portion of the lockfile. more improvements can be made here (aside from just removing deps), but this is a good start.

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