Linter: add rules for consistent spacing in imports and objects

[Ellpeck]

Currently, imports and object can have various styles:

import { something } from "somewhere"
import {something} from "somewhere"

let obj = { some: value }
let obj = {some: value}
let obj = {some: value   }

[EagleoutIce]

We want:

import { something } from "somewhere"

For object denotations i am not sure because they are usually multiline :D but i think i prefer the space variant.