Feature/internal resolve

[tvald]

Summary
Removes dependency on resolve package and pulls all necessary code into default_resolver.js, with minor cleanup and added type definitions.

This is a preparatory step for improving the performance of resolve (#2925).

Test plan

Passes all existing tests of the legacy resolve.sync() behavior.

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[tvald]

Not sure about the above errors, but I don't think they're related to this PR. Locally, all tests pass when I yarn test. (except four related to hg, which I don't have installed)

[tvald]

Fixed one problem that wasn't locally checked. (jest-resolve/index.js accessed the internals of the resolve package to leverage the helper node_modules_paths, which is now exposed within jest-resolve)

[tvald]

Note that there is a new file - jest-resolve/node_modules_paths.js, which should have the standard ++header++ added to it. (I don't know what your current standards are, so I'll leave that to a maintainer.)

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[thymikee]

Can you add the copyright header just like in other files?
Also, since it's adapted from resolve, an extra annotation is necessary:

 /**
  * Copyright (c) 2014, Facebook, Inc. All rights reserved.
  *
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  *
  * Adapted from: https://github.com/substack/node-resolve
  * 
  * @flow
  */

[tvald]

Done in 3313380

[tvald]

One more fix, this time to remove unused optional fields that flow(?) was complaining about.

Generally speaking, it would be nice if (a) CI didn't fail so frequently for unrelated problems, and (b) it was possible / obvious how to run all checks locally.

[cpojer]

Thanks for the initial PR, this is great! In a follow-up, do you mind changing all the single-expression if-statements to wrap them with curly-braces? That's the code style we use in this repo :)

[cpojer]

Also, could we add support for the "browser" field in a follow-up and remove "browser-resolve"? I would love it if we could drop that dependency :)

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