chore: use System.HashCode struct to generate hash code instead of XOR values

[MohammadHadi2031]

I recommend to use HashCode

Pros:

• Part of .NET itself, as of .NET Core 2.1/.NET Standard 2.1 (though, see con below)
  • For .NET Framework 4.6.1 and later, the Microsoft.Bcl.HashCode NuGet package can be used to backport this type.
• Looks to have good performance and mixing characteristics, based on the work the author and the reviewers did before merging this into the corefx repo
• Handles nulls automatically
• Overloads that take IEqualityComparer instances

[jasontaylordev]

Thank you, this is much better. 😀