Missing 'Required Contexts Per Event' details and missing Context data schema details

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Which topic?

https://developer.adobe.com/commerce/services/shared-services/storefront-events/sdk/context/

### What's wrong with the content?

I have had several partners and customers confused how to implement events or debug events when they don't work. It seems we don't include documentation of the required context data object schema and contexts or distinguish how to verify events and context data that are sent to the adobeDatalayer are actually sent to Sensei. This confuses partners and merchants, leading to them giving up trying to implement Recommendations, blaming Adobe and frustrated with not being able to implement it. Support resources do not seem to suggest this either, leading to more frustration.

### What changes do you propose?

* [Github events documentation](https://github.com/adobe/commerce-events/tree/main/examples) has the required Context data objects for each Event required, and the Context data schema required. These examples of each event, the required context data, and the context data schema for each context data type should be moved into explicit Experience League pages and linked from this page.

### Anything else that can help to cover this?

None