[Enhance] Log coco metric copypaste.

[RangiLyu]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

Log copypaste message.

Modification

Add log info.

Logs

2022/10/13 11:29:44 - mmengine - INFO - Epoch(test) [50/100]    eta: 0:00:03  time: 0.0669  data_time: 0.0053  memory: 116  
2022/10/13 11:29:46 - mmengine - INFO - Epoch(test) [100/100]    eta: 0:00:00  time: 0.0414  data_time: 0.0008  memory: 116  
2022/10/13 11:29:47 - mmengine - INFO - Evaluating bbox...
2022/10/13 11:29:52 - mmengine - INFO - bbox_mAP_copypaste: 0.519 0.672 0.561 0.321 0.551 0.718
2022/10/13 11:29:53 - mmengine - INFO - Epoch(test) [100/100]  coco/bbox_mAP: 0.5190  coco/bbox_mAP_50: 0.6720  coco/bbox_mAP_75: 0.5610  coco/bbox_mAP_s: 0.3210  coco/bbox_mAP_m: 0.5510  coco/bbox_mAP_l: 0.7180

[ZwwWayne]

May add the log results in PR message to better reveal this PR.