fix(schema-compiler): validation and docs for quarter granularity

[buntarb]

Check List

• [x] Tests has been run in packages where changes made if available
• [x] Linter has been run for changed code
• [x] Tests for the changes have been added if not covered yet
• [x] Docs have been added / updated if required

Issue Reference this PR resolves

[For example #12]

Description of Changes Made (if issue reference is not provided)

[Description goes here]

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b5cc5b5) 42.79% compared to head (2579ca5) 42.79%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5046   +/-   ##
=======================================
  Coverage   42.79%   42.79%           
=======================================
  Files         153      153           
  Lines       20232    20232           
  Branches     5192     5192           
=======================================
  Hits         8658     8658           
  Misses      10741    10741           
  Partials      833      833           

Flag	Coverage Δ
cube-backend	42.79% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...bejs-schema-compiler/src/compiler/CubeValidator.js	96.82% <100.00%> (ø)

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