Date and time literals

[jesper-friis]

Description

Proper ISO 8601 handling of date and time literals, including support for xsd:datetime, xsd:date, xsd:time and xsd:duration.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

Attention: Patch coverage is 94.36620% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.45%. Comparing base (e1defbd) to head (b03df42).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tripper/literal.py	94.36%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
+ Coverage   83.28%   83.45%   +0.17%     
==========================================
  Files          28       28              
  Lines        3936     4002      +66     
==========================================
+ Hits         3278     3340      +62     
- Misses        658      662       +4     

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