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Add option to remove trailing comma

This option is available in prettier so implementing it is trivial.
Needs the 'estree' prettier plugin, which is responsible for formatting
JSON. As a result, this might increase the size of the language server.

eg. in the following, when 'yaml.format.trailingComma` is set to `false`, the last comma should be removed:

```yaml
{
  key: 'value',
  food: 'raisins',
  airport: 'YYZ',
  lightened_bulb: 'illuminating',
}
```

See redhat-developer/vscode-yaml#1112

Signed-off-by: David Thompson <davthomp@redhat.com>

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