Deprecate date parse

[bmac]

This pr deprecates overriding Date.parse however it keeps the current behavior (and where it differs from the native date.parse) for the date transform.

This pr supersedes #4231 and #4275

[pangratz]

LGTM 👍

[rwjblue]

This makes me very happy, thank you!

[seanmhoffman]

deprecation id: ds.date.parse-deprecate

I'm going to leave this here in hopes that a web crawler will pick it up. I was pretty confused when I got this deprecation warning and couldn't find reference to the deprecation id anywhere. Keep up the good work 👍

[c0achmcguirk]

When I deprecrated extending dates it broke a lot of my app and my tests. It seemingly stopped extending strings, arrays, and functions.

I expanded the config/environment.js like this and now it works (after restarting server and tests of course).

EmberENV: {
  FEATURES: {
    // Here you can enable experimental features on an ember canary build
    // e.g. 'with-controller': true
  },

  EXTEND_PROTOTYPES: {
    Date: false,
    String: true,
    Array: true,
    Function: true
  }
},

Notice the extra extend lines for String, Array and Function.