HTTP Header support in talaria.

[Sachin4403]

Hi Team,

As of today, there is no way to pass custom HTTP headers to talaria when CPE is making a WSS request, now our requirement here is we need to pass CPE public IP to talaria and talaria should be able to add the same in device metadata and further whenever an event is dispatched from talaria during this point of time we should be able to send the CPE public IP as a part of device metadata in the event. Header reading will be derived from the config and will be disabled by default.

we need it in form of an HTTP header because CPE is making a WSS connection with Nginx and Nginx is maintaining the WSS connection with talaria so this custom header will be injected by Nginx.

cc: @schmidtw