Fix 0size config lines - #713
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PR Description
本 PR 优化 to_0_size_config.py 的配置解析和 0-size 用例生成逻辑，主要包括：
支持拆分同一行中连续粘连的多个 paddle.* API 调用，兼容嵌套括号及字符串内容，避免配置解析失败。
针对 paddle.concat、paddle.add_n 等算子的超长同质 Tensor 容器，按照 kernel 输入数量的关键分支进行边界取样，减
少重复的逐位置枚举。
保留容器首尾位置和关键 0-size 场景，尽量维持原有测试覆盖。
对暂未注册折叠规则的算子继续使用原有枚举逻辑，并输出告警，避免未经验证地减少测试覆盖。
整体上可以提升配置预处理的兼容性，并降低超长配置生成时的用例数量和处理开销。