Add analytics wiring

[mathemancer]

Related to #4063

This adds some machinery to collect and transmit analytics data reports to a URL specified in the settings.

Technical details

• The AnalyticsReport model shows all information collected.
• This PR does not include any way to turn the analytics on or off, except from the Django shell. They are disabled by default.
• If one enables the analytics reporting (using the Django shell), then
  • Reports are saved to the AnalyticsReport model once per day.
  • We attempt to then transmit the analytics reports after saving one. Without adding a URL to receive the reports to the environment variables, this will fail.

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• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[Anish9901]

LGTM! I'm curious about why the MATHESAR_ANALYTICS_URL isn't added in the docker-compose.yml

[mathemancer]

LGTM! I'm curious about why the MATHESAR_ANALYTICS_URL isn't added in the docker-compose.yml

I plan to remove that environment variable anyway. We'll hardcode the URL in the settings file. But, I don't want to publish the URL until we have some DDOS, etc. protection on it. So, I set it up so a core team developer can just use an environment variable while testing without risking accidentally committing the URL in the settings file.