refactor(database): column header

[zqran]

This pr mainly contains the following changes

1. Directory structure

.
├── column-header
│   ├── column-header.ts
│   ├── column-move
│   │   ├── column-drag-indicator.ts
│   │   ├── column-drag-preview.ts
│   │   └── index.ts
│   ├── column-width
│   │   └── index.ts
│   └── styles.ts

2. Encapsulation of two functions
   2.1 initChangeColumnWidthHandlers is used to handle changing the column width
   2.2 initMoveColumnHandlers is used to handle drag and drop to change the column order

---

part of: #629

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[doodlewind]

Great improvement!