Add a rule to prevent static import of (already) dynamically imported files

[willdurand]

See also: mozilla/addons-frontend#7017 (comment)

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The idea is to avoid referencing code from a dynamically (code-splitted) imported file so that we don't impact the main bundle.

Maybe there is a plugin that exists already, and if that suits our needs, then no need to write a rule. We can adopt the plugin in addons-frontend directly.

[kumar303]

The idea is to avoid referencing code from a dynamically (code-splitted) imported file so that we don't impact the main bundle.

Specifically, the rule should forbid a static import of any path that is dynamically imported in Routes.js.