feat(zstd): support reading uncompressed size

Author: FineFindus

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

@@ -73,6 +73,10 @@ impl Decode for ZstdDecoder {
         Ok(bytes_left == 0)
     }
 
+    fn uncompressed_size(&mut self, input: &mut PartialBuffer<impl AsRef<[u8]>>) -> Option<usize> {
+        zstd_safe::find_frame_compressed_size(input.unwritten()).ok()
+    }
+
     fn finish(
         &mut self,
         output: &mut PartialBuffer<impl AsRef<[u8]> + AsMut<[u8]>>,