Add handling for Alexa Event requests

[calguy1000]

It would be useful if there was the ability to handle alexa skill events such as AlexaSkillEvent.SkillDisabled and AlexaSkillEvent.SkillPermissionAccepted which are just different request types.

[maxbeckers]

Thanks for the issue @calguy1000.

Here is the Json api description to this request types: https://developer.amazon.com/de-DE/docs/alexa/smapi/skill-events-in-alexa-skills.html

Would you like to implement them?