### What?
Adds a new `format` option to the `plugin-import-export` config that
allows users to force the export format (`csv` or `json`) and hide the
format dropdown from the export UI.
### Why?
In some use cases, allowing the user to select between CSV and JSON is
unnecessary or undesirable. This new option allows plugin consumers to
lock the format and simplify the export interface.
### How?
- Added a `format?: 'csv' | 'json'` field to `ImportExportPluginConfig`.
- When defined, the `format` field in the export UI is:
- Hidden via `admin.condition`
- Pre-filled via `defaultValue`
- Updated `getFields` to accept the plugin config and apply logic
accordingly.
### Example
```ts
importExportPlugin({
format: 'json',
})
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