Add REST API and Golang Examples for Sending Emails/Others via Azure Communication Services

there are examples for JS and .net like communication-services-javascript-quickstarts
## Description
There is a noticeable lack of detailed examples and documentation for using the REST API and Golang with Azure Communication Services to send emails. This issue aims to request the creation of comprehensive guides and examples similar to the existing JavaScript quickstarts, but tailored for Golang and REST API usage.

## Issue Type
- [x] feature request

## Minimal Steps to Reproduce
Not applicable as this is a documentation and example request.

## Log Messages
Not applicable.

## Expected/Desired Behavior
Provision of REST API examples and Golang documentation that includes:
- Authentication methods
- Request headers and bodies setup
- Response handling

## OS and Version
Not applicable.

## Versions
Not applicable.

## Additional Details
These resources will enable developers to integrate email functionalities using Golang or direct API calls effectively, enhancing the utility of Azure Communication Services in diverse development environments.

Inizia esaminando i quickstart JavaScript esistenti in questo repository e la documentazione dell'API REST per le email di Azure Communication Services. Crea esempi comparabili in Go e REST che illustrino l'autenticazione, gli header e i body delle richieste e la gestione delle risposte. L'attività sarà completata quando i nuovi esempi e la documentazione mostreranno chiaramente come inviare email tramite entrambe le interfacce.

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