Move pagination utils into own module

This continues the pattern established in [1], just to chip away a
bit more at the random collection of stuff in utils/__init__.py.

[1]: https://github.com/alphagov/notifications-admin/pull/3923

app/main/views/dashboard.py

@@ -30,12 +30,11 @@ from app.utils import (
     DELIVERED_STATUSES,
     FAILURE_STATUSES,
     REQUESTED_STATUSES,
-    generate_next_dict,
-    generate_previous_dict,
     get_current_financial_year,
     service_has_permission,
 )
 from app.utils.csv import Spreadsheet
+from app.utils.pagination import generate_next_dict, generate_previous_dict
 from app.utils.user import user_has_permissions
 
 

app/main/views/jobs.py

@@ -33,18 +33,17 @@ from app.formatters import get_time_left, message_count_noun
 from app.main import main
 from app.main.forms import SearchNotificationsForm
 from app.models.job import Job
-from app.utils import (
-    generate_next_dict,
-    generate_previous_dict,
-    get_page_from_request,
-    parse_filter_args,
-    set_status_filters,
-)
+from app.utils import parse_filter_args, set_status_filters
 from app.utils.csv import generate_notifications_csv
 from app.utils.letters import (
     get_letter_printing_statement,
     printing_today_or_tomorrow,
 )
+from app.utils.pagination import (
+    generate_next_dict,
+    generate_previous_dict,
+    get_page_from_request,
+)
 from app.utils.user import user_has_permissions
 
 

app/main/views/platform_admin.py

@@ -27,12 +27,12 @@ from app.statistics_utils import (
     get_formatted_percentage,
     get_formatted_percentage_two_dp,
 )
-from app.utils import (
+from app.utils.csv import Spreadsheet
+from app.utils.pagination import (
     generate_next_dict,
     generate_previous_dict,
     get_page_from_request,
 )
-from app.utils.csv import Spreadsheet
 from app.utils.user import user_is_platform_admin
 
 COMPLAINT_THRESHOLD = 0.02

app/main/views/uploads.py

@@ -45,17 +45,17 @@ from app.s3_client.s3_letter_upload_client import (
     upload_letter_to_s3,
 )
 from app.template_previews import TemplatePreview, sanitise_letter
-from app.utils import (
-    generate_next_dict,
-    generate_previous_dict,
-    get_page_from_request,
-    unicode_truncate,
-)
+from app.utils import unicode_truncate
 from app.utils.csv import Spreadsheet, get_errors_for_csv
 from app.utils.letters import (
     get_letter_printing_statement,
     get_letter_validation_error,
 )
+from app.utils.pagination import (
+    generate_next_dict,
+    generate_previous_dict,
+    get_page_from_request,
+)
 from app.utils.templates import get_sample_template, get_template
 from app.utils.user import user_has_permissions