Django-import-export-extensions

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* Add more detailed documentation for package features

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* Support settings from original package

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* Improve GitHub workflow name
* Get rid of DjangoObjectActions and implement default django admin action instead (Maybe later we can extend this)
* Use mixins.BaseExportMixin, mixins.BaseImportMixin and admin.ImportExportMixinBase from original package for celery admin mixins
* Use admin/import_export/ templates instead of copies in admin/import_export_extensions/
* Small improvements:

* Fix static folder name
* Fix invoke command to run celery
* Fix progress bar widget
* Rename filter_class to filterset_class
* Add cancel_job action for exporting

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* Add coverage badge

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* Migrate from ``setup.py`` and ``setup.cfg`` to ``pyproject.toml``

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* Add support for `STORAGES` settings variable