Add ENUM column

[vjik]

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

Related to yiisoft/db#1107

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.82%. Comparing base (dfac432) to head (d1fddb4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Column/ColumnDefinitionBuilder.php	90.47%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #382      +/-   ##
============================================
- Coverage     98.00%   97.82%   -0.19%     
- Complexity      242      250       +8     
============================================
  Files            26       26              
  Lines           803      827      +24     
============================================
+ Hits            787      809      +22     
- Misses           16       18       +2     

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[Copilot]

Pull request overview

This PR adds support for ENUM column types in Oracle by leveraging CHECK constraints with IN clauses. Since Oracle doesn't have native ENUM types, the implementation maps ENUM columns to VARCHAR2 with CHECK constraints that restrict values to a predefined list.

Key changes:

• Added regex-based parsing to extract enum values from CHECK constraints in table schemas
• Implemented automatic VARCHAR2 size calculation for ENUM columns based on the longest value
• Refactored buildCheck method to delegate enum constraint generation to the parent class

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Column/EnumColumnTest.php	Adds test cases for enum column detection and validation, including negative test cases for non-enum CHECK constraints
tests/Support/IntegrationTestTrait.php	Adds a dropTable helper method for safely dropping tables in tests using PL/SQL error handling
src/Schema.php	Implements tryGetEnumValuesFromCheck method to parse CHECK constraints and extract enum values using regex
src/Column/ColumnDefinitionBuilder.php	Adds ENUM to VARCHAR2 type mapping with automatic size calculation and refactors buildCheck to use parent implementation for enum constraints
CHANGELOG.md	Documents the new enumeration column type support feature

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