feat: Extended the menu/order metadata

[radektomasek]

Enrich selections with itemGroup and salesCategory names

Resolves missing human-readable names on the selections table by building in-memory lookup dictionaries from the menus data and injecting them before writing orders to CSV.

Changes

• component.py: Added _item_group_names and _sales_category_names dicts on __init__
• component.py: download_menus now populates both lookup dicts from menus_menuGroups and menus_menuGroups_menuItems parsed output
• component.py: download_orders enriches each record in orders_checks_selections with itemGroup_name and salesCategory_name before writing
• component.py: Reordered run() to call download_menus before download_orders so lookups are populated in time
• parser_mapping.json: Added itemGroup_name and salesCategory_name to selections.column_mappings

How to test

1. Configure the component with both menus and orders in the endpoints list
2. Run the component against a restaurant that has orders
3. Open the output selections.csv and verify:
   • itemGroup_name is populated with the menu group name (e.g. "Burgers") and matches the itemGroup_guid
   • salesCategory_name is populated (e.g. "Food") and matches the salesCategory_guid
   • Cross-reference both values against menuGroups.csv and menuItems.csv from the same run
4. Verify selections where itemGroup_guid or salesCategory_guid is empty/null produce empty strings rather than errors
5. Run with multiple restaurants to confirm lookups accumulate correctly across restaurants