Refactor ColumnSchemaBuilder::class, add shortcuts for generator columns, add new type column auto_increment, add more test.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#57

[codecov]

Codecov Report

Attention: Patch coverage is 96.10895% with 10 lines in your changes missing coverage. Please review.

Project coverage is 66.58%. Comparing base (df2151c) to head (259b2e8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/db/mssql/QueryBuilder.php	70.00%	6 Missing ⚠️
src/db/ColumnSchemaBuilder.php	94.80%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #76      +/-   ##
============================================
+ Coverage     66.52%   66.58%   +0.06%     
- Complexity    11234    11263      +29     
============================================
  Files           433      433              
  Lines         36512    36597      +85     
============================================
+ Hits          24289    24368      +79     
- Misses        12223    12229       +6     

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