Add "Notes" to Airports (#1467)

* Notes for Airports

Adds capability of having notes/remarks for airports, includes

* New database field
* Airport Model change
* CSV Import/Export capability for notes
* Admin Airports list page change
* Admin Airports edit page change
* Default Template Airport show page change

* Update Airport Tests

* Add the new field to source csv
* Check if the import works

* Update AirportFactory.php

Co-authored-by: Nabeel S <nabeelio@users.noreply.github.com>

app/Services/ImportExport/AirportImporter.php

@@ -30,6 +30,7 @@ class AirportImporter extends ImportExport
         'fuel_100ll_cost'      => 'nullable|numeric',
         'fuel_jeta_cost'       => 'nullable|numeric',
         'fuel_mogas_cost'      => 'nullable|numeric',
+        'notes'                => 'nullable',
     ];
 
     /**