Loader: allow a space between # and import word in gql files

[kidroca]

Allow the webpack loader to distinct imports written with a space like:

# import "./some/file.graphql"

I've stumbled on this while migrating a parcel project to webpack
In parcel imports work with a space, like in the example here: https://en.parceljs.org/graphQL.html#graphql

The change here allows for both #import and # import syntax to work

[apollo-cla]

@kidroca: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[kidroca]

Hi @hwillson
I'm not sure why this PR is not getting attention, maybe because it's not tied to an issue
Can you check it out or suggest somebody to take a look?

[hwillson]

Thanks @kidroca!