Prepare io release

ntex-io/src/tasks.rs

@@ -13,6 +13,12 @@ impl ReadContext {
         Self(io.clone())
     }
 
+    #[inline]
+    /// Io tag
+    pub fn tag(&self) -> &'static str {
+        self.0.tag()
+    }
+
     #[inline]
     /// Check readiness for read operations
     pub fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<ReadStatus> {
@@ -127,6 +133,12 @@ impl WriteContext {
         Self(io.clone())
     }
 
+    #[inline]
+    /// Io tag
+    pub fn tag(&self) -> &'static str {
+        self.0.tag()
+    }
+
     #[inline]
     /// Return memory pool for this context
     pub fn memory_pool(&self) -> PoolRef {