Chore/more error macros (#2686)

* cleaned up MixProcessingError

* Added Error impl to (hopefully) all error enums in the codebase

* Replaced all occurences of error("{0}") with error(transparent)

* Changelog entry

common/mixnode-common/src/packet_processor/processor.rs

@@ -51,7 +51,7 @@ impl SphinxPacketProcessor {
         packet: SphinxPacket,
     ) -> Result<ProcessedPacket, MixProcessingError> {
         packet.process(&self.sphinx_key).map_err(|err| {
-            debug!("Failed to unwrap Sphinx packet: {:?}", err);
+            debug!("Failed to unwrap Sphinx packet: {err}");
             MixProcessingError::SphinxProcessingError(err)
         })
     }