fix(schema-compiler): Fix cubes inheritance

[KSDaemon]

This PR fixes a bunch of issues related to cube inheritance. Among them are:

• Pre-aggregations are not inherited via extends in YAML-based models
• Joins are not inherited (when extends is used)
• Cubes using sql_table cant be exented with sql
• AccessPolicy inheritance
• Correct schema validation for inherited cubes

Also included:

• Additional tests for folders
• Additional tests for hierarchies
• Additional tests for accessPolicies
• Tuned schema validator to gather all model errors instead of throwing only the first one. So now, if your model has more then one error - you'll see them all at once instead of fixing them one-by-one.

Check List

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

Supersedes #8970

Closes #9269, #7137, #8519, #8609, #8970

[codecov]

Codecov Report

Attention: Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.

Project coverage is 48.05%. Comparing base (610820f) to head (7d8b19a).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...cubejs-schema-compiler/src/compiler/CubeSymbols.ts	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9386      +/-   ##
==========================================
+ Coverage   47.85%   48.05%   +0.19%     
==========================================
  Files         171      171              
  Lines       21422    21453      +31     
  Branches     3711     3722      +11     
==========================================
+ Hits        10252    10309      +57     
+ Misses      10738    10712      -26     
  Partials      432      432              

Flag	Coverage Δ
cube-backend	48.05% <98.21%> (+0.19%)	⬆️

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