Add support for generated fields

[msmakouz]

What was changed

Added support for GENERATED_FIELDS in the schema, which will be in the next version of Cycle ORM

Checklist

• Generated fields orm#462
• Add support for generated fields schema-builder#73

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (5565329) 92.02% compared to head (feb91a2) 91.87%.

❗ Current head feb91a2 differs from pull request most recent head f603c11. Consider uploading reports for the commit f603c11 to get more accurate results

Files	Patch %	Lines
src/Configurator.php	85.71%	2 Missing ⚠️
src/Annotation/Generated.php	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x      #95      +/-   ##
============================================
- Coverage     92.02%   91.87%   -0.15%     
- Complexity      296      310      +14     
============================================
  Files            37       38       +1     
  Lines           765      788      +23     
============================================
+ Hits            704      724      +20     
- Misses           61       64       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.