Alexa Skill Intents Lambda structs

**Is your feature request related to a problem? Please describe.**
For ease of use, it would be great if we could maintain structs representative of Alexa Skill intent requests and responses!

**Describe the solution you'd like**
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I have a representation of the structs i would like to port over too this package so they can be maintained and externally imported by large amounts of Alexa Skill developers!

https://github.com/jackmcguire1/alexa-chatgpt/tree/main/internal/pkg/alexa

**Describe alternatives you've considered**
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> Make sure all request and response types are concise with of that by a formal JSON payload.

> Other proposed implementations will be considered

**Additional context**
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https://github.com/jackmcguire1/alexa-chatgpt/tree/main/internal/pkg/alexa

Iniziate esaminando la directory internal/pkg/alexa indicata nel repository alexa-chatgpt collegato e confrontate le relative Request- e Response-Structs con i payload JSON formali per gli intent di Alexa Skill. Definite l’ambito supportato e confermate che i tipi risultanti possano essere importati esternamente e mantenuti in questo package.

Scritto dal modello di indicizzazione a partire dal testo della issue.