Add clj-kondo config for e/for-by

[simon-katz]

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[dustingetz]

CA received, thank you @simon-katz Per our DMs, the approach taken is that Kondo uses a mock/fake macroexpansion before linting. The capability has been available in Kondo for a couple years.

[simon-katz]

A few more details…

The clj-kondo feature is documented at https://github.com/clj-kondo/clj-kondo/blob/master/doc/hooks.md.

I've used the simple approach of a :macroexpand hook. This works pretty well, but one linting message is less than ideal: when e/for-by is called with the wrong number of arguments, the message is (for example) clojure.core/for is called with 1 arg but expects 2 [invalid-arity] — the mention of clojure.core/for is not ideal.

Something more sophisticated is probably possible using an :analyze-call hook.