可否考虑加强下载速度限制类功能设置

[yangxu9sp]

功能描述（请清晰的、详细的描述你想要的功能）

比如每下载n个图之后等待m分钟之类的

附加信息（其他的与功能相关的附加信息）

很多漫画一话其实是合并了很多话，导致页数很多
下载的时候经常连续下了几十张图以后就报错，应该是请求过于频繁导致被ban吧？
虽然下载里有"失败后1分钟重试"选项，但体感并不会解决这个问题
而页数少的就可以毫无问题的连续下载很多话

效果演示（可以提供可借鉴的图片）

Log

2023-03-08 18:05:59,816 - server.py[line:301] - INFO: request-> backId:232, DownloadBookReq, url:https://cdn-msp.jmapiproxy1.cc/media/photos/393543/00085.webp, proxy:{'http': None, 'https': None}, method:Download, headers:{'Accept-Encoding': 'None'}, params:{}
2023-03-08 18:05:59,834 - connectionpool.py[line:442] - DEBUG: https://cdn-msp.jmapiproxy1.cc:443 "GET /media/photos/393543/00085.webp HTTP/1.1" 200 None
2023-03-08 18:05:59,835 - tool.py[line:189] - ERROR: could not create decoder object
Traceback (most recent call last):
  File "tools\tool.py", line 176, in GetPictureSize
  File "PIL\Image.py", line 3009, in open
  File "PIL\Image.py", line 2995, in _open_core
  File "PIL\ImageFile.py", line 121, in __init__
  File "PIL\WebPImagePlugin.py", line 63, in _open
RuntimeError: could not create decoder object
2023-03-08 18:05:59,836 - user_handler.py[line:813] - ERROR: could not create decoder object
Traceback (most recent call last):
  File "server\user_handler.py", line 806, in __call__
  File "tools\tool.py", line 864, in SegmentationPicture
  File "PIL\Image.py", line 3009, in open
  File "PIL\Image.py", line 2995, in _open_core
  File "PIL\ImageFile.py", line 121, in __init__
  File "PIL\WebPImagePlugin.py", line 63, in _open
RuntimeError: could not create decoder object
2023-03-08 18:05:59,838 - download_status.py[line:34] - WARNING: Download error, bookId:393543, epsId:0, index:84, stMsg: