fix: correct syntax generation for column types with parameters

• Fix CHAR column type generation syntax
• Fix VARCHAR column type generation syntax
• Fix DECIMAL column type generation with precision and scale

Previously, the mapToLaravelType() method was returning malformed
strings like 'char, 10' which resulted in invalid migration syntax:
$table->char, 10('column_name');

This commit refactors the method to return an array structure
containing the method name and parameters separately, allowing
proper syntax generation:
$table->char('column_name', 10);
$table->string('column_name', 255);
$table->decimal('column_name', 8, 2);

Changes:

• Refactored mapToLaravelType() to return ['method' => '...', 'length' => '...']
• Updated getColumnDefinition() to handle new array structure
• Added proper parameter formatting for decimal types (precision, scale)

Tested with MySQL CHAR(10), VARCHAR(255), DECIMAL(8,2) columns"