feat: configurable caching for postgres with support for tracing

quaint/src/connector/metrics.rs

@@ -106,20 +106,19 @@ struct QueryForTracing<'a>(&'a str);
 
 impl fmt::Display for QueryForTracing<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let query = self
-            .0
-            .split_once("/* traceparent=")
-            .map_or(self.0, |(str, remainder)| {
-                if remainder
-                    .split_once("*/")
-                    .is_some_and(|(_, suffix)| suffix.trim_end().is_empty())
-                {
-                    str
-                } else {
-                    self.0
-                }
-            })
-            .trim();
-        write!(f, "{query}")
+        write!(f, "{}", strip_query_traceparent(self.0))
     }
 }
+
+pub(super) fn strip_query_traceparent(query: &str) -> &str {
+    query.rsplit_once("/* traceparent=").map_or(query, |(str, remainder)| {
+        if remainder
+            .split_once("*/")
+            .is_some_and(|(_, suffix)| suffix.trim_end().is_empty())
+        {
+            str.trim_end()
+        } else {
+            query
+        }
+    })
+}