Maybe add console.log to eslint rules

[snomiao]

Can we remove the console.log? Also, how do you imagine the validation will work generally? For other readers, it is (arguably) necessary as we cannot rely on compile-time check for third-party extensions.

Originally posted by @christian-byrne in #5074 (comment)

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[christian-byrne]

I'm in favor of adding that linting rule. We can't remove console.log at compile time since we don't do tree-shaking, I believe.

[snomiao]

update: we have tree-shaking now by @LittleSound in #6068

[christian-byrne]

We added the rule and we now drop console statements