Add support for java.sql.Date instantiation

[Copilot]

java.sql.Date lacks a no-arg constructor, causing InstantiationException when mocking beans with such fields:

Caused by: java.lang.InstantiationException: java.sql.Date
	at java.lang.Class.newInstance(Class.java:427)
	at com.github.jsonzou.jmockdata.mocker.BeanMocker.mock(BeanMocker.java:36)
Caused by: java.lang.NoSuchMethodException: java.sql.Date.<init>()

Changes

• SqlDateMocker: New mocker delegates to DateMocker and converts via new java.sql.Date(date.getTime())
• MockConfig: Register SqlDateMocker for java.sql.Date.class, following TimestampMocker pattern
• Tests: SqlDateBean with single field, array, and List; testSqlDateMock() validates direct and bean-field mocking

Usage

// Direct mocking now works
java.sql.Date date = JMockData.mock(java.sql.Date.class);

// Bean fields with java.sql.Date are properly instantiated
class Entity {
    private java.sql.Date createdDate;
}
Entity entity = JMockData.mock(Entity.class);  // No longer throws

Original prompt

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This section details on the original issue you should resolve

<issue_title>不支持java.sql.Date类型字段实例化</issue_title>
<issue_description>```
...
Caused by: com.github.jsonzou.jmockdata.MockException: java.lang.InstantiationException: java.sql.Date
at com.github.jsonzou.jmockdata.mocker.BeanMocker.mock(BeanMocker.java:47)
at com.github.jsonzou.jmockdata.mocker.ClassMocker.mock(ClassMocker.java:38)
at com.github.jsonzou.jmockdata.mocker.BaseMocker.mock(BaseMocker.java:35)
at com.github.jsonzou.jmockdata.mocker.BeanMocker.setFieldValueByFieldAccessible(BeanMocker.java:67)
at com.github.jsonzou.jmockdata.mocker.BeanMocker.mock(BeanMocker.java:44)
... 37 more
Caused by: java.lang.InstantiationException: java.sql.Date
at java.lang.Class.newInstance(Class.java:427)
at com.github.jsonzou.jmockdata.mocker.BeanMocker.mock(BeanMocker.java:36)
... 41 more
Caused by: java.lang.NoSuchMethodException: java.sql.Date.()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.newInstance(Class.java:412)
... 42 more

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes 不支持java.sql.Date类型字段实例化 #70

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