#228 Implementation of equals/hashCode of CubeId is reworked

[alexeiakimov]

Description

Fix for the #228.

Type of change

Internal implementation of CubeId is fixed, no changes in API or serialization format have been introduced

How Has This Been Tested? (Optional)

CubeIdTest is extended to include the scenarios what failed before the fix.

[codecov]

Codecov Report

Merging #229 (b261b85) into main (f066acf) will decrease coverage by 0.07%.
The diff coverage is 94.73%.

❗ Current head b261b85 differs from pull request most recent head c1c144f. Consider uploading reports for the commit c1c144f to get more accurate results

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   92.00%   91.94%   -0.07%     
==========================================
  Files          88       88              
  Lines        2214     2209       -5     
  Branches      168      164       -4     
==========================================
- Hits         2037     2031       -6     
- Misses        177      178       +1     

Files	Coverage Δ
...e/src/main/scala/io/qbeast/core/model/CubeId.scala	95.62% <94.73%> (-0.74%)	⬇️

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[alexeiakimov]

The PR closed, because of incorrect target branch. The fix is provided in the PR #231.