feat: initial work on tenor gif searching

crates/core/coalesced/src/error.rs

@@ -0,0 +1,20 @@
+use std::fmt::Display;
+
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub enum Error {
+    RecvError,
+    MaxConcurrent,
+    MaxQueue,
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Error::RecvError => write!(f, "Unable to receive data from the channel"),
+            Error::MaxConcurrent => write!(f, "Max number of tasks running at once"),
+            Error::MaxQueue => write!(f, "Max number of tasks in queue"),
+        }
+    }
+}
+
+impl std::error::Error for Error {}