Add parameter group to parameter definition import/export

[soininen]

The import/export tuple of parameter_definition was missing the optional parameter_group_name. This PR fixes the issue.

Re spine-tools/Spine-Toolbox#3087

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black & isort
• Unit tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (75bb8e0) to head (21a6b44).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #610   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
=======================================
  Files          82       82           
  Lines       11094    11094           
  Branches     1626     1626           
=======================================
  Hits         9509     9509           
  Misses       1228     1228           
  Partials      357      357           

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