Set the default unit of the component, windchill12

The default unit cannot be set. Currently, unit.rbinfo and the corresponding attribute type have been modified to set the unit default value, but the default for creating components is still ea.

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不能设置默认单位，目前修改了unit.rbinfo以及对应的属性类型中设置了单位默认值，但是创建部件默认还是ea