Added utils.get_datatype_class()

[jesper-friis]

Description

The function utils.get_datatype_class() is a workaround since I cannot find any better way to access rdfs:Datatype with owlready2. It is needed in asstring() when generating the EMMO class index on github.

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

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

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.86%. Comparing base (938dbb4) to head (4005dd5).

Files with missing lines	Patch %	Lines
ontopy/utils.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #804      +/-   ##
==========================================
+ Coverage   72.72%   72.86%   +0.14%     
==========================================
  Files          18       18              
  Lines        3721     3741      +20     
==========================================
+ Hits         2706     2726      +20     
  Misses       1015     1015              

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