* implementation of datasets and dataloader
* add testing file
* fix MergeDataset flag bug and QueryAwareDataset one shot setting bug
* Set all flag to 0 in three datasetwrapper
* Fix NwayKshotDataloader sampler bug and fix some review comments
* add pytest file
* add voc test data for pytest
* finish test file for few shot custom dataset
* finish test file for few shot custom dataset
* finish test file for few shot custom dataset
* finish test file for merge dataset
* finish test file nwaykshot dataset
* cover more coner case in both datasets and add test file for query aware dataset and nwaykshot dataset
* finish test file of dataloader and fix all random seed in test file
* remove config
* avoid ann info change
* fix voc comments
* fix voc comments
* Lyq dataset dataloader (#4)
* fix voc comments
* fix voc comments
* fix voc comments
* fix comment and refactoring FewShotCustomDataset FewShotVOCDataset
* add coco dataset and test file
* Lyq dataset dataloader (#6)
* fix comments
* fix comments
* Lyq dataset dataloader (#7)
* fix comments
* fix comments
* fix comments
Linyiqi