Implement WIPI String API#155

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mirusu400:feat/wipi-string-api

Commits on May 20, 2026

Add WIPI 1.2.1 String API: charset ctors, valueOf overloads, region/case ops
mirusu400
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fix decode, encode str support more encoding types
mirusu400
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Commits on May 22, 2026

fix(string): throw NullPointerException on null args and add valueOf tests
mirusu400
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