Lint sort order of data sheets

[frenic]

Alphabetically sorted data provides maintainability for large sheets. A linter that verifies the sort order would be nice! Maybe even with a --fixup flag that solves it for you (?).

Related #188 #196

[skyclouds2001]

I write a test for checking key orders in other repo:

https://github.com/skyclouds2001/mdn-tools/blob/master/checks/data-order-check.js

and result will output here:

https://github.com/skyclouds2001/mdn-tools/blob/master/results/unordered_data.json