Add PATCH/PUT request for Key Events API

_**Is your feature request related to a problem? Please describe.**_

- When creating key events, errors in the name, type or even date can occur and there is no possibility to update/modify it.
Nowadays, the event needs to be a) deleted and b) created again with the correct data.

_**Describe the solution you'd like**_

- Introduce the PUT request to be able to modify the name/type or date of the key event.

_**Describe alternatives you've considered**_

- PUT for endpoint `/sites/{siteId}/key-events/{keyEventId}`