feat: allow DateTimeOffset to date claims

[grosch]

Adds the ability to pass a DateTimeOffset to the date related claims. Closes #135

[daviddesmet]

Thanks again for taking care of adding DateTimeOffset and for refactoring the tests!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 58.82353% with 14 lines in your changes missing coverage. Please review.

Project coverage is 90.22%. Comparing base (a9672cc) to head (c802d3f).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/Paseto/Builder/PasetoBuilderExtensions.cs	50.00%	7 Missing ⚠️
src/Paseto/Validators/DateValidator.cs	65.00%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage   90.31%   90.22%   -0.09%     
==========================================
  Files         104      104              
  Lines        5099     5105       +6     
  Branches      329      330       +1     
==========================================
+ Hits         4605     4606       +1     
- Misses        494      499       +5     

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