Add IsNil function for checking nil values in Go

[K4L1Ma]

Description

This pull request introduces the IsNil function, which checks if a value is nil or if it's a reference type with a nil underlying value. The IsNil function is useful in cases where a simple equality check (x == nil) might not be sufficient to determine the nilness of a value.

Context

In Go, the behaviour of x == nil can vary based on the type of x. A more nuanced check is required to identify whether the underlying value is ' nil ' for reference types such as pointers, slices, maps, channels, functions, and interfaces. The reflect package provides the IsNil method, employed in this IsNil function to handle such cases.

Pre-Go 1.20 interfaces can't use [T comparable] so I did the check using the regular approach without Generics, I think in this case doesn't make much difference to have it using Generic the end goal is the same, receiving something and checking if that something is IsNil, without the need to push go version to v1.20

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8f90a52) 99.31% compared to head (34da3c6) 99.31%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #399   +/-   ##
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  Coverage   99.31%   99.31%           
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  Files          15       15           
  Lines        2037     2040    +3     
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+ Hits         2023     2026    +3     
  Misses         13       13           
  Partials        1        1           

Flag	Coverage Δ
unittests	99.31% <100.00%> (+<0.01%)	⬆️

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