options to transform between DataTypeAttribute(DataType.Date) and DateOnly

[zijianhuang]

If the property is DateOnly, option to generate to DateTimeOffset with DataTypeAttribute(DataType.Date).

DateOnlyToDateTimeOffset, default is false.

If the property is DateTime or DateTimeOffset decorated by DataTypeAttribute(DataType.Date), option to generate to DateOnly or the same data type with DataTypeAttribute(DataType.Date).

DateTypeDateToDateOnly, default is true.

[zijianhuang]

Although technically I could do something inside class Poco2CsGen, however, probably not so worthy since .NET Framework will be fade out. Adding extra check before adding type reference is not worthy. I may just use a PS script to replace "public DateOnly" with "DataTypeAttribute(DataType.Date) public DateTimeOffset".