zbus 3.8.0

• Add AsyncDrop trait. Until there is an upstream Rust support for async dropping we will need this for explicit drop of async resources.
• Implement AsyncDrop for MessageStream, SignalStream, & macro-generated signal streams. This will allow users to immediately deregister the associated match rules (if any).
• Gracefully handle peer disconnection during handshake.
• Don't disallow EXTERNAL auth in server handshake.
• Skip self in handshake traces. Otherwise it creates a lot of noise.
• More conformance to the D-Bus specification:
  • Don't create messages larger than 128 MiB.
  • Don't accept messages larger than 128 MiB.
• Gracefully handle peer disconnection during handshake phase.
• Fix server-side handshake code to not eat up the first Hello method call from the client if the client is too fast for the server.
• Add more tracing to handshake machinery.
• Fix ToString implementation of MatchRule to include arg0namespace.
• Dependencies changed:
  • ordered-stream 0.1.4.
• Internal improvements & fixes.