goals: `rc-zip` transitively free of `syn`

[CosmicHorrorDev]

it'd be nice if relying on rc-zip didn't bring in syn too

• 🕊️ oem_cp relying on serde_derive in a build script
  • generate code tables in test over build script tats-u/rust-oem-cp#16
• 🕊️ num_enum Drop num_enum for a manual implementation #120
• 👿 ownable in-progress
  • consider splitting out an ownable_core or ownable_traits crate alexkazik/ownable#12
  • refactor: expose the core alexkazik/ownable#13
  • needs a breaking change for ownable_core@1 breaking change wishlist #134
• 🕊️ thiserror refactor: manually implement thiserror code #122
• 🕊️ tracing-attributes Miscellaneous feature cleanup #121