Add support for dependencies using local paths

[ddzz]

CDVC reports inconsistencies for the following local dependencies:

{
  "name": "@scope1/package1",
  "dependencies": {
    "foo": "file:./my-local-package"
  }
}

{
  "name": "@scope1/package2",
  "dependencies": {
    "foo": "link:./my-local-package"
  }
}

But running --fix does not resolve the inconsistency.

[kachkaev]

Seems related to #344

[bmish]

It may not be safe to fix this since they have different behavior? I'm not sure what the behavior should be.

name	Example	Description
File	file:./my-package	Copies the target location into the cache
Link	link:./my-folder	Creates a link to the ./my-folder folder (ignore dependencies)

https://yarnpkg.com/features/protocols