Add formula relations to calculators constructor

[olexandervanzuriak]

#989

Code reviewers

• @loqimean
• @KseniaGovorun

Summary of issue

Add relation to calculators constructor so that they looks similar to dippers calculator relations

Result

Added select input field on creating calculator constructor

Video.mp4

Results on show page

Video2.mp4

Summary of change

Added relation field to formula model and validations for it

CHECK LIST

• СI passed
• Сode coverage >=95%
• PR is reviewed manually again (to make sure you have 100% ready code)
• All reviewers agreed to merge the PR
• PR meets all conventions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.36%. Comparing base (e558ac1) to head (a35c312).
Report is 1 commits behind head on calculators-constructor.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           calculators-constructor    #1006      +/-   ##
===========================================================
+ Coverage                    89.14%   89.36%   +0.22%     
===========================================================
  Files                           68       69       +1     
  Lines                         1059     1081      +22     
===========================================================
+ Hits                           944      966      +22     
  Misses                         115      115              

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