🐞 Attachments Storage Performance

### Description

With the new [text attachments API ](https://github.com/CodeEditApp/CodeEditTextView/pull/93), we're introducing a potential performance pitfall in the attachment storage object.

Right now, it stores attachments in an array ordered by range start location. This is fine for querying, as we can do a simple binary search to find attachments. However insertion and removal could be improved as they're both `O(N)` due to array modification performance.

阅读 PR #93 中的文本附件 API，并定位本 issue 中描述的附件存储对象。检查其按范围排序的数组，以及插入、移除和二分查找查询的工作方式；完成标准是提升插入和移除性能，同时不破坏现有查询行为。

由索引模型根据 Issue 内容生成。