Refactoring of Schema::normalizeDefaultValue() method

[Tigrov]

• CURRENT_TIMESTAMP for default value was not Expression()
• fix empty strings '' in default value
• fix single quote in default value
• fix DEFAULT NULL definition

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

[what-the-diff]

PR Summary

• Inclusion of new PHP built-in functions and updates to Schema.php
  The code now utilizes the PHP functions preg_match and str_replace to enhance data handling capabilities. The normalizeDefaultValue function has also been modified to handle null values or primary key situations, timestamp data type scenarios, and special characters within the default value more efficiently.

• Enhancements to SchemaProvider.php and update to handling default values
  The module Expression from Yiisoft\Db\Expression\Expression; is being used to improve default value handling in the 'char_col2' field. A new field, 'nvarchar_col', has been added with settings optimized for character string data including default value settings, maximum size, and handling of null values.

• Refinement to default value type for float_col field
  The handling of default values for the 'float_col' field has been updated to use an Expression instead of a raw string, thereby improving data accuracy and formatting consistency.

• Updates to oci.sql in line with SchemaProvider modifications
  The 'char_col2' field's default setting has been adjusted to match those set in SchemaProvider.php. An additional 'nvarchar_col' field has been added, set to handle strings up to 100 characters in length and have a default value as an empty string.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (fdd6eb0) 98.29% compared to head (f0b5a0d) 98.29%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #229      +/-   ##
============================================
- Coverage     98.29%   98.29%   -0.01%     
- Complexity      183      186       +3     
============================================
  Files            16       16              
  Lines           586      585       -1     
============================================
- Hits            576      575       -1     
  Misses           10       10              

Impacted Files	Coverage Δ
src/Schema.php	100.00% <100.00%> (ø)

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[vjik]

Please, add line to changelog

[samdark]

👍