feat(template): added template for cssObject

[gizeasy]

Adds the ability to create your own file template.
Useful when you need to export wrapped in StyleSheet.create

return lessTransformer.transform({
        src,
        filename,
        options: {...options, lessOptions},
        template: cssObject =>
          `var RN = require('react-native'); module.exports = RN.StyleSheet.create(${JSON.stringify(
            cssObject,
          )});`,
      });