Add tracing-trace

tracing-trace/src/error.rs

@@ -0,0 +1,19 @@
+#[derive(Debug)]
+pub enum Error {
+    Json(serde_json::Error),
+}
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str("error de/serializing trace entry:")?;
+        match self {
+            Error::Json(error) => std::fmt::Display::fmt(&error, f),
+        }
+    }
+}
+
+impl From<serde_json::Error> for Error {
+    fn from(value: serde_json::Error) -> Self {
+        Self::Json(value)
+    }
+}