• breaking: Remove the spa feature which should have been removed in 0.6.0 (#1802)
• added: Add Multipart. This is similar to axum::extract::Multipart
  except that it enforces field exclusivity at runtime instead of compile time,
  as this improves usability (#1692)
• added: Implement Clone for CookieJar, PrivateCookieJar and SignedCookieJar (#1808)
• fixed: Add #[must_use] attributes to types that do nothing unless used (#1809)