schemaFactoriesPath should not resolve to local path when it starts with a tilde

[zhouzi]

Currently schemaFactoriesPath automatically adds ./ at its start when it doesn't start with a .. It makes it impossible to reference a node module. near-operation-file-preset makes it possible to do so by prepending a tilde:

If you wish to use an NPM package or a local workspace package, make sure to prefix the package name with ~.

It should also work with factories that are not generated in the same directory as the schema factories. So if the path starts with a ~, that character should be removed and not resolved locally.