Generate a weekly report in a human-readable format

[k15z]

For example, the default message could be:

Based on a survey of {X} apps, the median eCPM {increased/decreased} by {X}% this week.

Furthermore, if we detect that the change is primarily driven by a particular geographic region, then we would append:

Geographically, the {North America/South America/MENA/Europe} region has the largest change week over week, with the eCPM {increasing/decreasing} by {Y%}.

And similarly for other breakdowns such as app genre, platform, and privacy/personalization settings. It will start with descriptive statistics for now; eventually, after we have more confidence, it could be upgraded to include forecasts for the next week.

Short term: It can be displayed as a dialog/alert box on the home page and/or Network eCPM view. If people are interested, it can also be posted to r/admob's weekly eCPM discussion pinned post.

Ideal end state: Weekly reports as a medium length blog post, with nice figures / diagrams. It should also be generated after major holidays and events? This should largely powered by a LLM which paraphrases existing templates.