add script to populate cms database

[elfkuzco]

Rationale

This PR adds a script that scans through warehouses, finds zim files and tries to populate CMS database with books/titles based on zim_info retreived from file

Changes

• create utils/zim.py for keeping zim-related functions (copied from zimfarm/worker)
• add script to populate cms database from zim files in local warehouses

This closes #144

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.31%. Comparing base (f6df578) to head (1d0cedc).
⚠️ Report is 3 commits behind head on cms-upgrade.

Additional details and impacted files

@@             Coverage Diff              @@
##           cms-upgrade     #153   +/-   ##
============================================
  Coverage        80.31%   80.31%           
============================================
  Files               43       43           
  Lines             1702     1702           
  Branches           149      149           
============================================
  Hits              1367     1367           
  Misses             291      291           
  Partials            44       44           

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[benoit74]

I did not test this but we can anyway fix this after merge should we detect a bug.

Question: will this script be packaged inside the Docker image? It should, in a specific folder just like on Zimfarm (for convenience to access them easily from the container). And any reason to not have a maint-scripts folder in repo just like on Zimfarm?

[benoit74]

LGTM