Fix Unicode encoding issues in Bazel's use of Starlark #24417
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Bazel internally uses
Stringas a container for raw bytes assumed to be UTF-8, which differs from ordinary usage ofStringas a container for UTF-16 characters. This requires special implementations of certain Starlark functions that care about the notion of a "character":{l,r,}splitmust not strip non-ASCII whitespace as those may be part of a UTF-8-encoded non-whitespace character.json.decodehas to emit UTF-8 bytes rather than UTF-16 characters.Compatibility is verified by running all script-based tests both parsed as UTF-8 and using Bazel's internal encoding.