[Feature]: Add "Device Emulation" to the "thousandeyes_web_transaction" resource

[omaslara]

Hi team,

The thousandeyes_web_transaction resource for the current Terraform provider version (2.0.9) doesn't have an argument to set the Device Emulation value.

Check the resource documentation here: https://registry.terraform.io/providers/thousandeyes/thousandeyes/2.0.9/docs/resources/voice

It would be great to have a way to provision a Web Transaction test from Terraform with the Device Emulation parameter value. Similar to what can be done via the UI on the test advance settings tab: