feat: Add workspace field to httpconfiguration

[santhoshramaraj]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

• Add workspace field to httpconfiguration

• Read the workspace from <ProgramData>\National Instruments\salt\conf\grain for file-based httpconfiguration

• Add os.getenv("PROGRAMDATA") as a fallback option to get <ProgramData> path logic.

Why should this Pull Request be merged?

Automated Agent role does not support write access to several services. Applications that run on the remote system that need write access to these unsupported services must use user's API key. Default workspace of user's API key may not be the same as that of an Automated Agent.

workspace field of httpconfiguration helps the user application to use the remote system's default workspace even when using user's API key.

What testing has been done?

Manually tested on local machine with SystemLink client,

from nisystemlink.clients.core import HttpConfigurationManager
print(HttpConfigurationManager.get_configuration().workspace)

Test Result:

• If the SystemLink Client is connected, workspace_id is successfully obtained
• If the SystemLink Client is not connected, ApiException: No SystemLink configurations available