Move crates under a sub folder to clean up the code

tracing-trace/src/error.rs

@@ -1,21 +0,0 @@
-#[derive(Debug)]
-pub enum Error {
-    Json(serde_json::Error),
-}
-
-impl std::error::Error for 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)
-    }
-}