Django-easy-report

* Buffer for report using temp file

* Add action for generate reports on Admin page
* Improve prevent of load SENDER_CLASSES and/or REPORT_CLASSES
* Improve doc

* Improve doc
* Fix API doc
* Prevent load reports or senders classes not allowed by settings.

* Add support for storage secrets allowing add it on configuration
* Update docker image

* Add github actions
* Improve tests
* Improve doc
* Fix python setup.py requirements

Initial relase
* Run reports on Celery
* API report
* Docker image
* Allows permissions by report.
* Allows multi storage systems.
* Allows prevalidation before generate.
* Detect same report params to allows cache it.
* Allows add requeters to a existing report.
* Allows customize send flow inside the report code.