Add destructuring support conformance test

[Roaders]

for 2.3 we need to add a conformance test to ensure that DesktopAgent methods are bound to the DA instance.

For Web applications this will essentially test the GetAgent DesktopAgentProxy but for preload agents this will test the preloaded implementation.

example use case:

const agent = await getAgent();
const  {raiseIntent} = agent;

raiseIntent("my-intent", {type: "my-context"});