🔖 zvariant 5.0.0

• ⚡️ Signature now an enum representing the D-Bus signature in a parsed form.
• ⚡️ Replace Type::signature method with a const named SIGNATURE. This greatly improves the
  (de)serialization performance, in some cases even up by 94%.
• ✨ Implement Type for:
  • cells.
  • remaining std collections.
  • usize and isize.
  • socket addresses.
  • weak pointers.
  • ranges.
  • atomics.
  • wrapper types.
  • chrono::{Month, NaiveTime, Weekday}.
  • camino utf-8 path types.
• 🚸 Allow zbus attribute in macros.
• ✨ Type derive macro now validates user provided signature string at compile-time.
• 🚚 Rename DynamicType::dynamic_signature to signature.
• ⬆️ Bump MSRV to 1.81.
• 🔥 Drop API deprecated in 4.0.
• 💥 Drop now unneeded CompleteType type.
• 🥅 Error out on attempt to create an empty structure.
• 🔥 Drop Default impl for Structure. An empty structure is against the specification and we
  shouldn't allow it to be created, let alone be a default value. Users should use StructureBuilder
  to create a structure.
• 🏷️ Add Error::EmptyStructure.
• 🙈 Hide gvariant::Deserializer from public API.
• 🔥 Drop unnecessary checks for option-as-array feature.
• ⚡️ Don't check strings for embedded null bytes. In most cases (I'd say at least 99.9% of
  them), this is needless. They've a non-zero cost, which is high enough to be noticeable in case of
  a lot of strings being serialized.
• 🐛 Fix deserialization of recursive variants from JSON. JSON will decode a variant as a map and
  our Value's Visitor implementation wasn't handling that. This resulted in us not being able
  to decode back our own generated JSON in case of variants inside variants. #549
• 🚚 Drop weird Value type and field names when (de)serializing. This is no longer needed. While
  this doesn't completely fix #176, this goes as far as we can IMO. For D-Bus we need the signature
  to be able to derialize any data to a Value.
• ⚡️ Micro optimization of byte arrays.
• 🔥 Basic::alignment now implemented for you.
• 🏷️ Add Error::InvalidSignature variant.
• 📝 Better document Str type.
• ➕ New dependencies
  • nom (indirectly through zvariant_utils).
  • zvariant_utils.