Feature Request: Add support for esm config files .ncurc.mjs

[danielpza]

Since https://github.com/azu/rc-config-loader doesn't support esm config files, this project doesn't as well. See azu/rc-config-loader#22

Consider using an alternative like https://github.com/cosmiconfig/cosmiconfig for loading config file, which supports esm configuration files