Migrate from datapackage to frictionless

[soininen]

Resolves #491

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 81.93%. Comparing base (0886a0f) to head (3da6a3d).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   81.94%   81.93%   -0.01%     
==========================================
  Files          78       78              
  Lines       10316    10318       +2     
  Branches     1550     1550              
==========================================
+ Hits         8453     8454       +1     
- Misses       1493     1494       +1     
  Partials      370      370              

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