Alacritty has default keyboard shortcuts to navigate between paragraphs
in vi mode:

- shift-{: `ParagraphUp`
- shift-}: `ParagraphDown`

This change unlocks them to use in Zed's terminal. The keybindings can
be easily overridden via keymap.yml like that:

```yaml
{
    "context": "Terminal && vi_mode",
    "bindings": {
        "ctrl-up": ["terminal::SendKeystroke", "shift-{"],
        "ctrl-down": ["terminal::SendKeystroke", "shift-}"],
    }
}
```

Release Notes:

- Added support for navigating up or down paragraphs in the terminal,
when vim vi mode is enabled, with `shift-{` and `shift-}`, respectively.

---------

Co-authored-by: dino <dinojoaocosta@gmail.com>