docs: [FC-0074] add real life use cases based on community adoption

[mariajgrimaldi]

Description

This PR adds a list of community use cases based on the results of GraphQL queries and GH searches. You can review the result here: https://docsopenedxorg--228.org.readthedocs.build/projects/openedx-filters/en/228/reference/real-life-use-cases.html

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi!

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[sarina]

Would it make sense to add a sentence at the bottom inviting readers to submit a PR to this repo to add in their own filter examples if they wish?

[mariajgrimaldi]

@sarina: I love the idea! I'm on it :)

[sarina]

Love it!