Reformat the data-by-group.json to be an array rather than on object.

[DaveBagler]

This pull request changes the format of data-by-group.json. Rather than group names being property keys, the file is an array of group objects with name, slug and emojis properties.

Current Format

{
  "Smileys & Emotion": [
    {
      "emoji": "😀",
      "skin_tone_support": false,
      "name": "grinning face",
      "slug": "grinning_face",
      "unicode_version": "6.1",
      "emoji_version": "2.0"
    },
  ],
  ...
}

Format in this PR

[
  {
    "name": "Smileys & Emotion",
    "slug": "smileys_emotion",
    "emojis": [
      {
        "emoji": "😀",
        "skin_tone_support": false,
        "name": "grinning face",
        "slug": "grinning_face",
        "unicode_version": "1.0",
        "emoji_version": "1.0"
      },
      ...
    ]
  },
  ...
]

[muan]

Hi, thanks for the PR! Could you provide some context on why the change? I can see this may be handy in some cases but the DX improvement seems minimal to warrant a breaking change version bump for the package.

[DaveBagler]

Hi @muan,
Thanks for responding so quickly, and sorry for the late reply.

The current JSON object requires array-style access and is harder to type in typescript. The array of group objects is much easier to type as a typescript interface.

Additionally, adding the slug gives a nice key to use when passing group names through a translation system.

[muan]

Sorry for the delay in merging. Thanks for the work. I think it makes a lot of sense.