report location of invalid package config

[Yoorkin]

Feature Request

When you are trying to remove a dependency from a project, if you remove the items in deps (in moon.mod.json) first, you will get this error:

error: No matching module was found for xxx/xxxx...

This is because the packages belonging to that module were imported in some moon.pkg.json files. It is hard to find the invalid moon.pkg.json when the project grows large. So, it is better to report the location of the config files, ideally:

In xxx/xxx/moon.pkg.json (line n): No matching module was found for xxx/xxxx