[Feature] Detect top scope functions that should be namespaced.

Note: A module that wants to call a function in another module must either have that module listed as a dependency, or have no dependencies entry at all in its metadata.json. This requirement is enforced at runtime to help users keep metadata for modules up to date as users then simply need to install a module and its dependencies. If a module does not have the correct dependencies listed the runtime will simply not find the function.

Can PES detect topscope function calls which should be namespaced?

Ref - https://twitter.com/BastelsBlog/status/1193595803618725889
Ref - https://github.com/puppetlabs/puppet-specifications/blob/master/language/func-api.md#autoloading

Start with the Puppet function API autoloading specification and the runtime requirement for dependencies in metadata.json. Define how PES should identify top-scope calls that require namespaces and what diagnostic or behavior would indicate completion; the issue names no implementation entry point or test file.