chore: Map country column during CSV import

spec/jobs/data_import_job_spec.rb

@@ -188,6 +188,32 @@ RSpec.describe DataImportJob do
       end
     end
 
+    context 'when the data contains country column' do
+      let(:data_with_country) do
+        [
+          %w[id name email phone_number country],
+          ['1', 'John Doe', 'john-country@example.com', '+918080808081', 'United States'],
+          ['2', 'Jane Smith', 'jane-country@example.com', '+918080808082', 'India'],
+          ['3', 'Bob Wilson', 'bob-country@example.com', '+918080808083', '']
+        ]
+      end
+      let(:country_data_import) { create(:data_import, import_file: generate_csv_file(data_with_country)) }
+
+      it 'maps the country column to the standard country_code field' do
+        described_class.perform_now(country_data_import)
+
+        john = Contact.from_email('john-country@example.com')
+        expect(john.country_code).to eq('United States')
+        expect(john.additional_attributes['country']).to eq('United States')
+
+        jane = Contact.from_email('jane-country@example.com')
+        expect(jane.country_code).to eq('India')
+
+        bob = Contact.from_email('bob-country@example.com')
+        expect(bob.country_code).to eq('')
+      end
+    end
+
     context 'when the data contains labels column' do
       let(:data_with_labels) do
         [