Add process_mmg_responses

Refactor process_firetext_responses
Removed the abstract ClientResponses for firetext and mmg. There is a map for each response to handle the status codes sent by each client.
Since MMG has about 20 different status code, none of which seem to be a pending state (unlike firetext that has 3 status one for pending - network delay).
For MMG status codes, look for 00 as successful, everything else is assumed to be a failure.

tests/app/clients/test_firetext.py

@@ -1,32 +1,33 @@
 import pytest
 
-from app.clients.sms import firetext
-
-responses = firetext.FiretextResponses()
+from app.clients.sms.firetext import get_firetext_responses
 
 
 def test_should_return_correct_details_for_delivery():
-    assert responses.response_code_to_message('0') == 'Delivered'
-    assert responses.response_code_to_notification_status('0') == 'delivered'
-    assert responses.response_code_to_notification_statistics_status('0') == 'delivered'
-    assert responses.response_code_to_notification_success('0')
+    response_dict = get_firetext_responses('0')
+    assert response_dict['message'] == 'Delivered'
+    assert response_dict['notification_status'] == 'delivered'
+    assert response_dict['notification_statistics_status'] == 'delivered'
+    assert response_dict['success']
 
 
 def test_should_return_correct_details_for_bounced():
-    assert responses.response_code_to_message('1') == 'Declined'
-    assert responses.response_code_to_notification_status('1') == 'failed'
-    assert responses.response_code_to_notification_statistics_status('1') == 'failure'
-    assert not responses.response_code_to_notification_success('1')
+    response_dict = get_firetext_responses('1')
+    assert response_dict['message'] == 'Declined'
+    assert response_dict['notification_status'] == 'failed'
+    assert response_dict['notification_statistics_status'] == 'failure'
+    assert not response_dict['success']
 
 
 def test_should_return_correct_details_for_complaint():
-    assert responses.response_code_to_message('2') == 'Undelivered (Pending with Network)'
-    assert responses.response_code_to_notification_status('2') == 'sent'
-    assert not responses.response_code_to_notification_statistics_status('2')
-    assert not responses.response_code_to_notification_success('2')
+    response_dict = get_firetext_responses('2')
+    assert response_dict['message'] == 'Undelivered (Pending with Network)'
+    assert response_dict['notification_status'] == 'sent'
+    assert not response_dict['notification_statistics_status']
+    assert not response_dict['success']
 
 
 def test_should_be_none_if_unrecognised_status_code():
     with pytest.raises(KeyError) as e:
-        responses.response_code_to_object('99')
+        get_firetext_responses('99')
     assert '99' in str(e.value)