Add an optional lineSize parameter to the Activity indicator

**Is your feature request related to a problem? Please describe.**
When using the activity indicator in a large size the default line width doesn't look right for my project (and I imagine for most projects it might be the same)

**Describe the solution you'd like**
Added an optional `lineSize` parameter to the component that lets you specify exactly what size you want.

**Describe alternatives you've considered**
There aren't really any other options.

**Additional context**

定位 Activity 指示器组件，并检查其现有的尺寸相关 API 以及附近的使用方式。当可选的 lineSize 参数允许调用方控制线条宽度，同时不改变当前默认行为时，工作即完成；如果组件已有检查或测试，请运行它们。

由索引模型根据 Issue 内容生成。