✨ Command to list extensions

## Proposed Addition

| Argument | Description |
| :- | :- |
|`-le` or `--list-extensions` | Outputs list of installed extensions |

## Description

Lists the installed extensions unique identifiers along with optional display name, author, status, size, and version.

## Examples

### Usage

```
codeedit --list-extensions
```
```
codeedit -le
```

Which would output...

```
johnsmith.react
janedoe.eslint
jakedaniels.prettier
```

You can also pass an additional flag to get more information

```
codeedit --list-extensions -l
```

Which would output...

```
ID Name Author Version
===================================================
johnsmith.react React John Smith 1.1.4
janedoe.eslint ESLint Jane Doe 2.1.2
jakedaniels.prettier Prettier Jake Daniels 1.6.3
```