Change io.spine.time.testing to io.spine.testing.time

[alexander-yevsyukov]

This PR adjusts the Time TestLib packages to comply with our guidelines.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.43%. Comparing base (9bc2722) to head (4c86f74).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #181   +/-   ##
=========================================
  Coverage     89.43%   89.43%           
  Complexity      293      293           
=========================================
  Files            55       55           
  Lines           965      965           
  Branches         25       25           
=========================================
  Hits            863      863           
  Misses           94       94           
  Partials          8        8           

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