Migration to TemplateString API, and testlib module

[alexander-yevsyukov]

This PR updates the dependency on Validation, migrating to the recently introduced TemplateString API.

Also, the testutil-time module was renamed to spine-testlib to match the naming with testlib artifacts of other Spine SDK libraries.

Changes in details

The method WhenConstraint.errorMessage() now returns TemplateString as required by new Constraint interface API. The method adds the value of the ${field.time} placeholder with the value of the TimeOption.in constraint set on the field.

Build changes

Latest config was applied. Hence the number of modified files.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 89.11%. Comparing base (3c6dc55) to head (28732d4).
Report is 15 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #173      +/-   ##
============================================
- Coverage     89.82%   89.11%   -0.71%     
+ Complexity      293      292       -1     
============================================
  Files            53       53              
  Lines           894      900       +6     
  Branches         21       21              
============================================
- Hits            803      802       -1     
- Misses           86       92       +6     
- Partials          5        6       +1