docs: [FC-0074] add naming suggestions to use when creating new events

[mariajgrimaldi]

Description

This PR adds naming suggestions for implementing new Open edX Events.

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[sarina]

Do you think the name should always have a verb in it? Generally would it always be a verb in past tense eg created, enrolled, succeeded, failed?

[mariajgrimaldi]

In this commit I specified where this standard we've enforced so far comes from: 34562b1. So yes, according to the naming and versioning ADR, those are the usual verbs that are used for the event type string when following OEP-41.