Refactor ColumnSchema::class in MSSQL, MySQL, Oracle, PostgreSQL.

[terabytesoftw]

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

[codecov]

Codecov Report

Attention: Patch coverage is 89.01734% with 19 lines in your changes missing coverage. Please review.

Project coverage is 66.79%. Comparing base (9694dcd) to head (0b1bff7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/db/ColumnSchema.php	74.54%	14 Missing ⚠️
src/db/mssql/ColumnSchema.php	89.47%	2 Missing ⚠️
src/db/mysql/ColumnSchema.php	94.73%	1 Missing ⚠️
src/db/oci/ColumnSchema.php	94.11%	1 Missing ⚠️
src/db/pgsql/ColumnSchema.php	95.23%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #111      +/-   ##
============================================
- Coverage     66.81%   66.79%   -0.02%     
+ Complexity    11209    11195      -14     
============================================
  Files           434      435       +1     
  Lines         36536    36546      +10     
============================================
+ Hits          24410    24411       +1     
- Misses        12126    12135       +9     

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