Refactor NativeLoader to load any library

### Description

NativeLoader only loads altbn128 native library, it should be refactored to load any library

### Aceptance criteria

```java
public class NativeLoader {

  public static boolean load(Class jniClass, String nativeLibraryName, String 
    nativeLibraryFolderPath) throws Exception {
      ...
  }

  ...

}
```