export the utility method requirements.resolveRequirements() as extension API

[testforstephen]

Currently the Java Debugger and Test Runner have the duplicated logic to check JDK installation directory. Could the vscode-java return the resolved RequirementsData value as the return value of activate function? By this way, other extensions can get the resolved java_home info directly.

   const extension = vscode.extensions.getExtension("redhat.java");
   const extensionApi = await extension.activate();
   return extensionApi.requirementsData;

[ThadHouse]

I'm having to do the same thing in an extension that runs gradle commands, so this would definitely be something very useful to any extension that needs the JDK.

[fbricon]

@testforstephen can you provide a PR for that?

[testforstephen]

@fbricon yeah, i submit a PR for this, please help a review.

[fbricon]

Thanks for the fix @testforstephen