chore: enforce consistent spacing around object curlys (#5700)

The codebase was incredibly inconsistent with the use of spacing around
curly braces, e.g.:

```
// this?
const a = {b: 1}
// or?
const a = { b: 1 }
```

This extended into import statements also. Google's styleguide is no
spacing, so we're going with that.

.eslintrc.js

@@ -33,6 +33,7 @@ module.exports = {
         }],
         "brace-style": [2, "1tbs", {"allowSingleLine": true}],
         "curly": [2, "multi-or-nest", "consistent"],
+        "object-curly-spacing": [2, "never"],
         "new-parens": 2,
         "func-call-spacing": 2,
         "arrow-parens": [2, "as-needed"],