message: Add path exists and get file size
diff: @@ -660,6 +660,19 @@ void Stat(const TF_Filesystem* filesystem, const char* path,
  TF_SetStatus(status, TF_OK, "");
  }
  +void PathExists(const TF_Filesystem* filesystem, const char* path,
  + TF_Status* status) {
  + TF_FileStatistics stats;
  + Stat(filesystem, path, &stats, status);
  +}
  +
  +int64_t GetFileSize(const TF_Filesystem* filesystem, const char* path,
  + TF_Status* status) {
  + TF_FileStatistics stats;
  + Stat(filesystem, path, &stats, status);
  + return stats.length;
  +}
  +
  // TODO(vnvo2409): Implement later
  } // namespace tf_s3_filesystem
  