feat(schema-compiler): Support view extends

[KSDaemon]

Makes it possible to inherit some views from others.

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

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.52%. Comparing base (4697600) to head (b331432).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...cubejs-schema-compiler/src/compiler/CubeSymbols.ts	93.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9507      +/-   ##
==========================================
+ Coverage   58.47%   58.52%   +0.04%     
==========================================
  Files         169      169              
  Lines       13990    14002      +12     
  Branches     2275     2282       +7     
==========================================
+ Hits         8180     8194      +14     
+ Misses       5495     5493       -2     
  Partials      315      315              

Flag	Coverage Δ
cube-backend	58.52% <94.11%> (+0.04%)	⬆️

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