Feat use selection improvements

[PascalSenn]

Improvements on UseSelection

[TheJayMann]

I noticed that this pull request implements a SingleOrDefault middleware. Could a FirstOrDefault middleware be added as well, or even modify the SingleOrDefault middleware to be generic enough that it either uses SingleOrDefault or FirstOrDefault depending on how it was set up? Something like public static IObjectFieldDescriptor UseSingleOrDefault(this IObjectFieldDescriptor descriptor, bool allowMultipleResults).

[michaelstaib]

We are still missing first or default. I really think that first or default is what we want not single or default. I will rework the pr to include first or default.

[sonarcloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
8 Code Smells

82.0% Coverage
1.2% Duplication

[michaelstaib]

@TheJayMann we opted for a second attribute.

We will add more attributes in 11 but for 10 I thing with FirstOrDefault and SingleOrDefault we should be ok