feat(export): allow including table visible columns

[billmn]

Description

Added the includeVisibleColumns() method to the Export actions, enabling exports to automatically match the columns visible in the table.

ExportAction::make()
    ->exporter(VehicleExporter::class)
    ->includeVisibleColumns(),

ExportBulkAction::make()
    ->exporter(VehicleExporter::class)
    ->includeVisibleColumns(),

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When columnMapping is enabled, visible columns are checked by default (in this example "created_at" column is hidden).

---

When columnMapping is disabled, restricts the export to only the visible columns.

ExportAction::make()
    ->exporter(VehicleExporter::class)
    ->includeVisibleColumns()
    ->columnMapping(false),

---

If the implementation looks good, I can follow up with an update to the documentation to reflect the new behavior.

Visual changes

None

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.