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Configure authentication for the SMS provider webhook

When you configure the SMS provider webhook to forward SMS messages to SMS Gateway, you can provide a URL for either an unsecured or secured connection:

Unsecured connection: http://<host-address:unsecured-port>/sms.receiver/SmsRecv
Secured connection: https://<host-address:secured-port>/sms.receiver/SmsRecv

For additional security, you can configure HTTP Basic authentication for the webhook in the SMS Gateway configuration.

Specify a user name and password for the webhook.

Single-tenant environment: In the SMS Gateway configuration, specify the SMS_WEBHOOK_USERNAME and SMS_WEBHOOK_PASSWORD environment variables.

For example, on Docker:
```
 - SMS_WEBHOOK_USERNAME=myUserName
 - SMS_WEBHOOK_PASSWORD=p4ssw0rd
```
Multi-tenant JSON configuration: In your tenant configuration JSON file, configure a webHookCredentials object with username and password properties.

"tenants": [
   {
    "tenantPhoneNumber": "+12345556789",
    "description": "Number for accessing account information",
    ...
    "webHookCredentials": {
      "username": "myUserName",
      "password": "p4ssw0rd"
    }
    ...
   }
]

In the console for your SMS provider, configure the webhook for the tenant by adding the user name and password to the URL in the following format: https://<user:password>@<host address:secure port>/sms.receiver/SmsRecv

For example:
```
https://myUserName:p4ssw0rd@123.4.5.67:9443/sms.receiver/SmsRecv
```