How to: Join or leave a channel
Allows the user to join or leave a channel (chat or group).

```tsx
joinGroup(userID: UUID, channelID: UUID): boolean
leaveGroup(userID: UUID, channelID: UUID): boolean
```

**Parameters**

User ID (`UUID`): ID of the current user.

Channel ID (`UUID`): ID of the channel (chat or group) the user wants to join or leave.

**Returns**

Result (`boolean`): Represents whether the operation was successful or not.