Add sorting to tables

Users need to be able to sort tables by a column of their choice. These tables are;

- Gig statistics page. User should be able to sort by name, number of gigs this operating year, and total number of gigs.
- Rehearsal stats page. User should be able to sort by name and percentage/number of rehearsals attended.

首先定位 Gig statistics 和 Rehearsal stats 页面及其表格组件。查看每个表格如何提供其行和显示的列，然后为 issue 中列出的列实现排序。完成的标准是，用户可以在两个页面上选择所请求的排序字段，并且行会相应更新。

由索引模型根据 Issue 内容生成。