Complete default values feature

[natemcmaster]

Closes #82

[codecov]

Codecov Report

Merging #421 (8c2a3d2) into main (3eb90d7) will decrease coverage by 0.11%.
The diff coverage is 64.10%.

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
- Coverage   67.87%   67.76%   -0.12%     
==========================================
  Files         105      105              
  Lines        3175     3282     +107     
==========================================
+ Hits         2155     2224      +69     
- Misses       1020     1058      +38     

Impacted Files	Coverage Δ
...neUtils/Conventions/ArgumentAttributeConvention.cs	40.74% <22.50%> (-6.76%)	⬇️
...Utils/Conventions/OptionAttributeConventionBase.cs	43.47% <41.93%> (ø)
src/CommandLineUtils/Internal/ReflectionHelper.cs	73.01% <64.28%> (-2.99%)	⬇️
src/CommandLineUtils/CommandArgument{T}.cs	96.66% <95.45%> (+5.75%)	⬆️
src/CommandLineUtils/CommandOption{T}.cs	96.66% <95.45%> (+5.75%)	⬆️
...mmandLineUtils/Abstractions/ValueParserProvider.cs	59.09% <100.00%> (-1.35%)	⬇️
src/CommandLineUtils/CommandArgument.cs	94.73% <100.00%> (+7.23%)	⬆️
src/CommandLineUtils/CommandOption.cs	69.01% <100.00%> (+1.36%)	⬆️
...mandLineUtils/HelpText/DefaultHelpTextGenerator.cs	94.73% <100.00%> (-0.54%)	⬇️
.../CommandLineUtils/Internal/CommandLineProcessor.cs	83.04% <100.00%> (+0.43%)	⬆️
... and 5 more

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