Upgrade http client

[brandondoran]

Overview

This upgrades the http client and related code for handling the file uploads. To the end users there should be no noticeable change in functionality.

• Replaces deprecated request dependency with node-fetch.
• Switch to use tapPromise hook instead of tapAsync. This will allow using async/await or promises instead of callbacks
• Remove async dependency and convert methods to async/await instead of callbacks.
• Update tests to work with async/await instead of callbacks
• Remove lodash.reduce, lodash.find and use native array methods instead.
• Introduce optional chaining and null coalescing support

🛠️ Testing

Setup

Use react example to serve as an integration test of sorts. The example uses .env to set env vars needed for S3 and Rollbar. Create .env from example and fill it with your own settings:

cp examples/react/.env.example examples/react/.env

To simplify setup, comment out S3Plugin instances in examples/react/webpack.config.js so you don't need AWS creds.

Test steps

• rm -rf node_modules && npm i
• build the plugin: npm run build
• build react example:

  cd examples/react
  npm i
  npm run build
  

• this will build the app, upload 2 js assets to s3 and 2 sourcemaps to Rollbar

  98% after emitting RollbarSourceMapPlugin
  Uploaded app-8231cb50df131c68dc45.js.map to Rollbar
  Uploaded vendors~app-ab928b5b25b3b2eff91b.js.map to Rollbar
  <w> [webpack.Progress] 2619ms after emitting
  

[codecov-io]

Codecov Report

Merging #260 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #260   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           95        87    -8     
  Branches        30        25    -5     
=========================================
- Hits            95        87    -8     

Impacted Files	Coverage Δ
src/RollbarSourceMapPlugin.js	100.00% <100.00%> (ø)
src/helpers.js	100.00% <100.00%> (ø)

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