Rename `subscription-ends` event to `subscription-ended` and add `subscription-started` and `subscription-updated`

**Problem description**
See updated Commonalities Subscription Guide [here](https://github.com/camaraproject/Commonalities/blob/main/documentation/CAMARA-API-Event-Subscription-and-Notification-Guide.md#34-subscription-ended-event).

**Expected behaviour**
- Rename `subscription-ends` event to `subscription-ended`
- Consider adding `subscription-started` and `subscription-updated` events

**Alternative solution**
None

**Additional context**
None


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Rename `subscription-ends` event to `subscription-ended` and add `subscription-started` and `subscription-updated` #55

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Rename subscription-ends event to subscription-ended and add subscription-started and subscription-updated #55

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Rename `subscription-ends` event to `subscription-ended` and add `subscription-started` and `subscription-updated` #55