feat request: null safe operator

[rr-nick-tan]

first of all, thanks for the nice project solves my problem a lot.

here is one feature request after using this module in more scenarios of the projects, i'd like to have null safe operator
it's common that my struct is composite of primary and collect data, especially a map in the struct, so i'd like to access the field in the null safe way rather than error out
Ex.
https://www.danvega.dev/blog/2013/08/20/groovys-null-safe-operator/