[Bug] Add missing Tabs hotkeys to Shortcut settings

### Bug Description

Inside `appflowy_flutter/lib/workspace/presentation/home/hotkeys.dart` exists some hotkeys that are not included in the shortcut settings, and thus are not customizable.

These include some for tabs:
- Close current tab
- Go to next tab
- Go to previous tab

Additionally there are some other hotkeys that should also be added:
- Collapse sidebar menu
- Toggle theme mode

### How to Reproduce

1. Open AppFlowy
2. Open Settings
3. Navigate to Shortcuts
4. Cannot change eg. "Navigate to next tab" as it doesn't exist in the list

### Expected Behavior

1. Open AppFlowy
2. Open Settings
3. Navigate to Shortcuts
4. Can change the shortcut for "Navigate to next tab"

### Operating System

All

### AppFlowy Version(s)

0.3.1

### Screenshots

_No response_

### Additional Context

_No response_