[embedded] Provide Unicode data tables for embedded as a static library #73585
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Initial String port to embedded (#70446) skipped adding unicode data tables, and attempts to use anything that requires the data tables (e.g. string equality, hashing, splitting, etc.) will fail to link. This PR resolves this by providing a static library with the data tables, and embedded Swift users are expected to (manually) link this library if they want to use string operations that require data tables.
Note that we need to avoid depending on C++ headers because our -none targets don't have an SDK that would have those headers, I replaced usage of
<limits>
with<stdint.h>
.