Include prefixes from context when populating a triplestore from a csv file

[jesper-friis]

Description

Include prefixes from context when populating a triplestore from a csv file.

Also made the type argument of save_dict() optional in order to be consistent with as_jsonld().

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

All modified and coverable lines are covered by tests ✅

Project coverage is 76.87%. Comparing base (be2c21e) to head (7186882).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
+ Coverage   76.85%   76.87%   +0.01%     
==========================================
  Files          22       22              
  Lines        2467     2469       +2     
==========================================
+ Hits         1896     1898       +2     
  Misses        571      571              

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[francescalb]

Looks fine, but as it is a bug test it is clear that it is a feature that was not sufficiently tested. I would like a test for it.

[jesper-friis]

Looks fine, but as it is a bug test it is clear that it is a feature that was not sufficiently tested. I would like a test for it.

Added a test.