Add helper function for Slice deep copy

[CorentinClabaut]

It would be helpful to have a function like follows to simply create a deep copy of a slice. func DeepCopy[T any](collection []T) []T

No need for map deep copy function as it can be done with lo.Assign passing only one map in.

[trungdlp-wolffun]

Quickly, you can try https://github.com/jinzhu/copier

[CorentinClabaut]

Looks good @trungdlp-wolffun I didn't know this package, it seems to handle a lot of use cases.

In any case, it feels like this simple helper function can still be useful in the package for simple cases.