Add ENUM column

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️

Related to yiisoft/db#1107

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (3d67a71) to head (c973627).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #448      +/-   ##
============================================
+ Coverage     98.70%   98.73%   +0.02%     
- Complexity      252      259       +7     
============================================
  Files            24       24              
  Lines           775      791      +16     
============================================
+ Hits            765      781      +16     
  Misses           10       10              

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[Copilot]

Pull request overview

This PR adds native MySQL ENUM column type support by introducing the EnumColumn class and implementing the necessary building logic for column definitions.

Key Changes:

• Migrates enum_col test data from StringColumn to EnumColumn with the new values property
• Implements buildType() method support for generating ENUM(...) column definitions
• Adds buildCheck() method override to prevent redundant CHECK constraints on native ENUM columns
• Adds comprehensive test coverage for enum column functionality

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/Provider/SchemaProvider.php	Updates test data to use EnumColumn instead of StringColumn for enum columns with new values property
tests/Column/EnumColumnTest.php	Adds MySQL-specific tests for enum column parsing, including negative tests for non-enum CHECK constraints
tests/Column/ColumnDefinitionBuilderTest.php	Adds unit tests for building enum column definitions, including case-sensitivity handling
src/Column/ColumnDefinitionBuilder.php	Implements enum type building logic and CHECK constraint suppression for native MySQL ENUM types
CHANGELOG.md	Documents the new enumeration column type support feature

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