feat(xz): support reading uncompressed size

Author: FineFindus

crates/compression-codecs/src/xz/decoder.rs

@@ -87,6 +87,10 @@ impl Decode for XzDecoder {
         self.inner.flush(output)
     }
 
+    fn uncompressed_size(&mut self, input: &[u8]) -> Option<usize> {
+        self.inner.uncompressed_size(input)
+    }
+
     fn finish(
         &mut self,
         output: &mut PartialBuffer<impl AsRef<[u8]> + AsMut<[u8]>>,