feat(core): Support any path in src in the examples

This PR adds support for the following form of imports:

import { foo } from 'project-name/...'

Currently the only supported import types in the @example blocks are:

import { foo } from 'project-name'
import { foo } from 'project-name/lib/...'

Tests

There are no tests for src/core so I did some manual tests by running in this repo and in fp-ts as well.

CLI output in the Asciicast:

Here is also a Asciicast of a project I have that fails with master but works with the PR:

NOTE: I know this is a tool for your own projects and it aims to be opinionated. I will understand if you don't think the PR should be merged. I decided to create the PR since is a small change in code, instead of asking in an issue.

gcanti / docs-ts

feat(core): Support any path in src in the examples #12