Update dependencies and add support for Django 4.2

Merge pull request #207 from cfpb/django42

Update dependencies and support Django 4.2

Drop support for Django<3.2, repo fixes

What's Changed

• Added editorconfig, black, flake8, isort, pre-commit by @jslay-excella in #189
• Fix flake8 configuration by @chosak in #195
• Deprecate Django support before version 3.2 by @chosak in #196
• Use Python 3.8 to build releases by @chosak in #197

Full Changelog: 1.6.6...1.7.0

Batch pagination

Implement progressive batch pagination, which lets most searches get by with paginating only 200 results, and paginating deeper only on demand, via the "Next" button.

Reduce pagination depth

• Paginate to 1K hits instead of 10K
• Fix off-by-1 error that left off the last paginated page

Add cache tags to API responses

Merge pull request #184 from cfpb/add-cache-tag

Add a complaints cache tag to the api views

Remove outdated Elasticsearch env vars

Remove use of env vars ES7_HOST and COMPLAINT_DOC_TYPE

Convert elasticsearch7 imports to elasticsearch

Now that all consumerfinance.gov apps are using Elasticsearch 7, we no longer need to import the custom elasticsearch7 library.

Refactor ccdb API for Elasticsearch 7

This change should have little effect on search users, but it is a significant code update. Among the changes:

• Implements a new pagination method based on Elasticsearch's "search_after" values.
• Preserve accurate counts when searches return more than 10,000 hits, adapting to an Elasticsearch API change.
• Handles breaking changes to aggregation sizes.

Refactor API to use Elasticsearch 7.9

This change should have little effect on search users, but it is a significant code update. Among the changes:

• Implements a new pagination method based on Elasticsearch's "search_after" values.
• Preserve accurate counts when searches return more than 10,000 hits, adapting to an Elasticsearch API change.
• Handles breaking changes to aggregation sizes.

Support Django 3.2

Added support for Django 3.2