Add `locate` command

From #1068, @isc-bsherman

> Second, I would like to add a locate command that accepts the name of a resource (e.g. a class name ending with .CLS) and returns the name of the module that owns it according to the ^IPM.Storage.* globals. Many classes in HealthShare and beyond have names which do not match the name of the module, and doing a search outside of IPM is awkward. It would be easy to look up in the globals.

@isc-tleavitt

> "locate" would be pretty easy to implement, we already have code for it to support source control extensions (FindHomeModule).