add [each_err] & [fold_err] API to [Iter]

[Guest0x0]

Add two APIs, each_err and fold_err to the Iter type. These two APIs are similar to each and fold, except that the callback may raise an error. If the callback raises any error, the iteration stops immediately and raises the same error.

[coderabbitai]

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[bobzhang]

I think eventually, we should just have only one each function which accept the error callback, the optimizer should be able to generate as efficient code for callbacks without errors
cc @Yu-zh