Directory-components

[Full Changelog](https://github.com/uktrade/directory-components/pull/243/files)

Implemented enhancements
- Support SSO auth backend

Bugs fixed
- Fix landing page library version number detection

[Full Changelog](https://github.com/uktrade/directory-components/pull/242/files)

Implemented enhancements
- Display package version on demo homepage

[Full Changelog](https://github.com/uktrade/directory-components/pull/225/files)

Implemented enhancements
- Add overridable blocks to component templates to allow some services to modify them when needed

[Full Changelog](https://github.com/uktrade/directory-components/pull/241/files)

Implemented enhancements
- Can add custom css classes to fields via `Field.container_css_classes`
- Added `forms.field_factory` for streamlining creating augmented django form fields.
- Added `helpers.get_pagination_url`

Breaking changes
- members of `form.widgets`, `form.fields` are now imported from `forms` directly.

[Full Changelog](https://github.com/uktrade/directory-components/pull/240/file)

Bugs fixed
- Update lodash vulnerability

[Full Changelog](https://github.com/uktrade/directory-components/pull/228/files)

Implemented enhancements
- Add lazysizes library, which allows lazy loading of images (and more). Check out the directory-components app for usage notes.

Breaking changes
- Moved the JQuery script tag in `base.html` from block `head_js` to block `vendor_js`