Add support for selecting HTTP version used in the Synthetics HTTP API tests

[bkalcho]

What problem are you facing?

Lack of support for setting HTTP version in the Synthetics HTTP API tests. Currently, I do not see support for such setting.

How could Datadog Provider help solve your problem?

We need ability to define the httpVersion used with HTTP API test for Synthetics. As you may see from Datadog API this is supported via httpVersion parameter that is part of Options object. Allowed values are http1, http2, any. More information may be found here.
If support for this is implemented in the provider we might be able to select specific HTTP version to be used with requests created by the Synthetics tests.