eslint monorepo

[B4nan]

We currently have this JS eslint config and its TS version in https://github.com/apify/apify-eslint-config-ts, we were also discussing actor-specific rules, and we also have a custom config for apify-core.

We should move those into a single monorepo ideally.

Related: apify/actor-templates#89
Related: #13 (review)