Deprecation Guide for @ember/object#aliasMethod

@ember/object#aliasMethod is a little known and rarely used method that allows user's to add aliases to objects defined with EmberObject:

import EmberObject, { aliasMethod } from '@ember/object';

export default EmberObject.extend({
  foo: 123,
  bar() {
    console.log(this.foo);
  },
  baz: aliasMethod('bar'),
});

This can be refactored into having one function call the other directly:

import EmberObject from '@ember/object';

export default EmberObject.extend({
  foo: 123,
  bar() {
    console.log(this.foo);
  },
  baz() {
    this.bar(...arguments);
  },
});

Avoid defining methods directly on the class definition, since this will not translate well into native class syntax in the future:

// Do not use this, this is an antipattern! 🛑
import EmberObject from '@ember/object';

function logFoo() {
  console.log(this.foo);
}

export default EmberObject.extend({
  foo: 123,
  bar: logFoo,
  baz: logFoo,
});