add test objects for each important class for testing

[maureeungaro]

for example as in eventDataCollection:

static std::unique_ptr<GEventDataCollection> create(std::shared_ptr<GLogger> logger) {

	auto header = GEventHeader::create(logger);

	auto digi_data = GDigitizedData::create(logger);
	auto true_data = GTrueInfoData::create(logger);

	auto edc = std::make_unique<GEventDataCollection>(std::move(header), logger);
	edc->addDetectorDigitizedData("ctof", std::move(digi_data));
	edc->addDetectorTrueInfoData("ctof", std::move(true_data));

	return edc;
}