Validate arguments of public methods

[Zombach]

Cause
An externally visible method dereferences one of its reference arguments without verifying whether that argument is null (Nothing in Visual Basic).

You can configure this rule to exclude certain types and parameters from analysis. You can also indicate null-check validation methods.

Rule description
All reference arguments that are passed to externally visible methods should be checked against null. If appropriate, throw an ArgumentNullException when the argument is null.

If a method can be called from an unknown assembly because it is declared public or protected, you should validate all parameters of the method. If the method is designed to be called only by known assemblies, mark the method internal and apply the InternalsVisibleToAttribute attribute to the assembly that contains the method.

Describe the solution you'd like
I suggest covering this with additional tests.
Check every reference argument in the public API ArgumentNullException.ThrowIfNull(source).

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (6d758f5) to head (bbc9a14).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2246      +/-   ##
==========================================
+ Coverage   84.08%   85.33%   +1.24%     
==========================================
  Files         313      313              
  Lines        7444     7444              
  Branches     1122     1122              
==========================================
+ Hits         6259     6352      +93     
+ Misses        814      746      -68     
+ Partials      371      346      -25     

Flag	Coverage Δ
linux	85.33% <ø> (+1.24%)	⬆️
macos	85.33% <ø> (+1.24%)	⬆️
windows	85.33% <ø> (+1.24%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.