Gmoshkin/define enum with introspection

Summary

• fix: remove num-derive & num-traits in favor of define_enum_with_introspection

• feat: define_enum_with_introspection for enum introspection

• feat: const fn util::str_eq

Ensure that

• New code is covered by tests
• API is documented
• Changelog is up to date
• Version is bumped in the appropriate Cargo.toml files