In addition to jsx attr configuration, add object key config

[coreylight]

We have the ignoreAttribute option which is great and highly needed.
I have written codemods to automatically wrap strings in lingui components, and in my codemod I additionally check against a whitelist of object keys such as:

const test = {
  id: 'This is not localized'
  text: 'This is'
}

where id is opted out of the no-unlocalized lint rule
This is very similar to jsx attrs.
What do we think about including extra code to allow this config? Or apply the attrs config to objects too?

[timofei-iatsenko]

I think it's a good idea. We would happily accept PR on this. I think it should be a separate setting (not related to attributes)

[timofei-iatsenko]

Opened a PR #20