[#16] Add GRPC metrics interceptor

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

cryptography/src/main/java/info/frostfs/sdk/Base58.java

@@ -58,8 +58,7 @@ public class Base58 {
 
         byte[] checksum = getSha256(getSha256(data));
         var buffer = concat(data, Arrays.copyOfRange(checksum, 0, 4));
-        var ret = encode(buffer);
-        return ret;
+        return encode(buffer);
     }
 
     public static String encode(byte[] input) {