build: Convert core, hub, minimal and types to use eslint #2794
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Continuing from #2786, keep converting stuff to eslint.
This takes care of
@sentry/core,@sentry/hub,@sentry/minimaland@sentry/types.Same logic as the first done for
@sentry/browser,.eslintrc.jsand extend from main configGoal is to do one of these a day, so we finish by Friday 😄