Custom formatter for ex-info thrown by cljs.spec

Currently it's quite tricky to get good output from cljs.spec. Reason being that the ex-info thrown includes the full spec commentary in ex-message. This includes the serialised val which failed. In my case this can fill the console many times over.

Alex Miller recommended catching these exceptions and using the ex-data to present the spec nicely. (e.g. don't print the ex-message to the console). This would be fine except it's difficult to catch all errors due to the nature of how UI code executes (react render loop, re-frame dispatch queue, callbacks)

How about automatically detecting and pretty formatting ex-info errors thrown by cljs.spec?

该 issue 未指定文件、测试或入口点。首先定位 cljs-devtools 在哪里处理来自 UI 渲染循环、re-frame dispatch 队列和回调的未捕获错误，然后确定如何识别和格式化 cljs.spec ex-info，同时不打印 ex-message。当针对所描述的错误路径定义了行为并完成覆盖时，即可视为完成。

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