Add First and FirstOrZeroValue functions

[Alireza-Kiani]

adding two new functions to find.go for fetching the first element of the slice.

[samber]

To follow the go conventions, I would return value, ok instead of value, err.

To follow the samber/lo convention, I would replace "zero" with "empty" in naming.

func First[T]([]T) T

func FirstOrEmpty[T]([]T) T

func FirstOr[T]([]T, T) T

WDYT ?

[ccoVeille]

I agree. Also, why doesn't FirstOrZero depends on First ?

[Alireza-Kiani]

Hey guys, thanks for your replies. @samber You are right, the initial changes did not follow conventions properly, Updated the implementation according to your saying.

@ccoVeille Good point, I made a change to the implementation and right now other functions rely on the base First function for finding the first element instead of duplicate code.