feat(sms-authenticator) add option to specify api secret header

[petrsni]

Summary

Adds a new apiTokenHeaderField configuration option to the SMS authenticator, allowing to specify which HTTP header is used to transmit the API secret instead of always defaulting to Authorization.

Motivation

• Some SMS gateway APIs use non-standard authentication header names (e.g. access-token, api-key) instead of Authorization

Changes

SmsAuthenticatorFactory.java

• Added new apiTokenHeaderField config property (type String, defaults to Authorization)

ApiSmsService.java

• Read apiTokenHeaderField from config in the constructor (defaults to Authorization)
• Use apiTokenHeaderField instead of the hardcoded string "Authorization" when setting the auth header for both token-based and Basic Auth requests

Backward Compatibility

• Fully backward compatible — the default value is Authorization, so all existing configurations continue to work unchanged without any migration

[melegiul]

Thanks! Should be solved here similar with the attribute option
#367