7c2599a491
https://github.com/llvm/llvm-project/issues/175003 Create public function and entrypoints for iswdigit and add UTF8 test to iswalpha test. On CI there is no UTF8 build currently, so that test case will only run locally, but [wctype_utils_test.cpp](https://github.com/llvm/llvm-project/blob/main/libc/test/src/__support/wctype_utils_test.cpp) is written in a way that both ASCII and UTF8 tests run regardless of the build config.
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