[litertlm] Fix stat() overflow for large models on Windows in LiteRT-LM JNI#2147
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[litertlm] Fix stat() overflow for large models on Windows in LiteRT-LM JNI
Replaced raw stat() calls with FileExists utility from file_util.h in litertlm.cc.
stat() defaults to a 32-bit version on Windows (with UCRT/MSVCRT) which fails for files larger than 2GB (returning EOVERFLOW).
The FileExists utility uses std::filesystem::exists which is 64-bit safe.
Also updated BUILD file to depend on //third_party/odml/litert_lm/runtime/util:file_util.
Fixes #2000.