ESlint: add import sort plugin

[Pablo Pettinari]

Add the eslint-plugin-simple-import-sort plugin along with the suggested order proposed in ethereum#8865

Note: the scope of this issue does not include adding the prettier plugin. That should be covered in #62

[Pablo Pettinari]

cc @TylerAPfledderer

[Tyler Pfledderer]

@pettinarip commenting for assignment. Thank you!