Use of group as an argument is too generic

Would you be open to changing the argument groups to something more specific, such as split-groups? I can put up a PR if you like.

"group" is such a generic term and there are bound to be plugins which conflict.

首先定位 pytest 插件的参数解析入口点，以及通用“group”参数的所有使用位置。检查提议的“split-groups”名称是否得到一致使用，以及测试是否覆盖命令行接口；完成的标准是，重命名后的参数不再有引发通用名称冲突的风险。

由索引模型根据 Issue 内容生成。