Adds aliasMethod deprecation

[pzuraq]

See: emberjs/ember.js#17540

[rwjblue]

Have you thought about suggesting this:

import EmberObject from '@ember/object';
 function logFoo(obj) {
}
 export default EmberObject.extend({
  foo: 123,
  bar() {
    console.log(obj.foo);
  },
  baz() {
    return this.bar(...arguments);
  },
});

Seems "better" by some subjective sense, thoughts?

[pzuraq]

Can update to that instead