SQL: add missing Q_DECLARE_SHARED to the value types

QSqlField and QSqlRecord implemented all special member functions and
the member swap() function, but were missing the Q_DECLARE_SHARED
macro.

Found during Qt 6.6 API review

[ChangeLog][QtSql] QSqlField and QSqlRecord are now relocatable
types.

Pick-to: 6.6
Change-Id: Ia10f1d3fd9f634864be5b36d1d3903301adfa9ab
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>

src/sql/kernel/qsqlfield.h

@@ -88,6 +88,8 @@ private:
     QExplicitlySharedDataPointer<QSqlFieldPrivate> d;
 };
 
+Q_DECLARE_SHARED(QSqlField)
+
 #ifndef QT_NO_DEBUG_STREAM
 Q_SQL_EXPORT QDebug operator<<(QDebug, const QSqlField &);
 #endif

src/sql/kernel/qsqlrecord.h

@@ -69,6 +69,8 @@ private:
     QExplicitlySharedDataPointer<QSqlRecordPrivate> d;
 };
 
+Q_DECLARE_SHARED(QSqlRecord)
+
 #ifndef QT_NO_DEBUG_STREAM
 Q_SQL_EXPORT QDebug operator<<(QDebug, const QSqlRecord &);
 #endif