Localize notification_utils to the API

This changeset pulls in all of the notification_utils code directly into the API and removes it as an external dependency.  We are doing this to cut down on operational maintenance of the project and will begin removing parts of it no longer needed for the API.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

notifications_utils/countries/data.py

@@ -0,0 +1,67 @@
+import json
+import os
+
+
+def _load_data(filename):
+    with open(os.path.join(os.path.dirname(__file__), "_data", filename)) as contents:
+        if filename.endswith(".json"):
+            return json.load(contents)
+        return [line.strip() for line in contents.readlines()]
+
+
+def find_canonical(item, graph, key):
+    if item["meta"]["canonical"]:
+        return key, item["names"]["en-GB"]
+    return find_canonical(
+        graph[item["edges"]["from"][0]],
+        graph,
+        key,
+    )
+
+
+# Copied from
+# https://github.com/alphagov/govuk-country-and-territory-autocomplete
+# /blob/b61091a502983fd2a77b3cdb5f94a604412eb093
+# /dist/location-autocomplete-graph.json
+_graph = _load_data("location-autocomplete-graph.json")
+
+UK = "United Kingdom"
+
+ENDED_COUNTRIES = _load_data("ended-countries.json")
+ADDITIONAL_SYNONYMS = list(_load_data("synonyms.json").items())
+WELSH_NAMES = list(_load_data("welsh-names.json").items())
+_UK_ISLANDS_LIST = _load_data("uk-islands.txt")
+_EUROPEAN_ISLANDS_LIST = _load_data("european-islands.txt")
+
+CURRENT_AND_ENDED_COUNTRIES_AND_TERRITORIES = [
+    find_canonical(item, _graph, item["names"]["en-GB"]) for item in _graph.values()
+]
+
+COUNTRIES_AND_TERRITORIES = []
+
+for synonym, canonical in CURRENT_AND_ENDED_COUNTRIES_AND_TERRITORIES:
+    if canonical in _UK_ISLANDS_LIST:
+        COUNTRIES_AND_TERRITORIES.append((synonym, UK))
+    elif canonical in ENDED_COUNTRIES:
+        succeeding_country = ENDED_COUNTRIES[canonical]
+        if succeeding_country:
+            COUNTRIES_AND_TERRITORIES.append((synonym, succeeding_country))
+            COUNTRIES_AND_TERRITORIES.append((canonical, succeeding_country))
+    else:
+        COUNTRIES_AND_TERRITORIES.append((synonym, canonical))
+
+UK_ISLANDS = [(synonym, UK) for synonym in _UK_ISLANDS_LIST]
+
+EUROPEAN_ISLANDS = [(synonym, synonym) for synonym in _EUROPEAN_ISLANDS_LIST]
+
+# Copied from https://www.royalmail.com/international-zones#europe
+# Modified to use the canonical names for countries where incorrect
+ROYAL_MAIL_EUROPEAN = _load_data("europe.txt")
+
+
+class Postage:
+    UK = "united-kingdom"
+    FIRST = "first"
+    SECOND = "second"
+    EUROPE = "europe"
+    REST_OF_WORLD = "rest-of-world"