[Feature Request] Add data-plane client library for Azure Load Testing (azure-developer-loadtesting)

[itakedem]

Feature Request

The Go SDK currently only provides a management-plane library for Azure Load Testing (armloadtesting), which supports creating and managing Load Testing resources. However, there is no data-plane client library
for interacting with individual test definitions, test runs, and test results.

Data-plane client libraries already exist for other languages:

• Python: azure-developer-loadtesting
• .NET: Azure.Developer.LoadTesting
• JavaScript: @azure-rest/load-testing

Use Case

We need to programmatically list and inspect test definitions within a Load Testing account (e.g., GET /tests) to read configuration properties like publicIPDisabled and subnetId that are only available
through the data-plane API.

Currently, we work around this by making raw HTTP calls to the data-plane endpoint using the DataPlaneURI from the ARM resource and manually acquiring tokens with scope
https://cnt-prod.loadtesting.azure.com/.default. A native Go client would provide type safety, built-in authentication, and consistency with the other language SDKs.

API Reference

• Data-plane REST API: https://learn.microsoft.com/en-us/rest/api/loadtesting/dataplane(2022-11-01)/load-test-administration
• ARM SDK (existing): https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/loadtesting/armloadtesting

Expected Package

github.com/Azure/azure-sdk-for-go/sdk/developer/loadtesting (following the Python naming convention)