Nested object & array, array of nested object

[Llolow]

Close #116

It's possible now to transform you'r string of refs in refs document in firestore when you import them For exemple :

• Nested object
• Nested object with array
• Array of object
• Array of nested object

If you have a refs and you declare it in options it will be transformed

Like you can see :

[dalenguyen]

Hi @Llolow, thanks for your contribution! 🙏