feat: add transform method like dottie

[erfanium]

example:

const values = {
  'user.name': 'Gummy Bear',
  'user.email': '[email protected]',
  'user.professional.title': 'King',
  'user.professional.employer': 'Candy Mountain'
};
const transformed = dottie.transform(values);

/*
{
  user: {
    name: 'Gummy Bear',
    email: '[email protected]',
    professional: {
      title: 'King',
      employer: 'Candy Mountain'
    }
  }
}
*/

[stychu]

Yess Please !!! im looking for something like this over all the internet and cant fing anything suitable that works good with typescript. Here is something I was trying to glue up but its not working properly for building array types which I cant find solution to yet...
@sindresorhus It would be awesome to have an ability to do deepKeys( flatten) and the undo action however it would be called (unflatten maybe)

Unflatten using flat lib but with not 100% working typings