支持RangeSpecifiedFieldSelector使用指定字段的值域进行数据选择 #432
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目前的RangeSpecifiedFieldSelector类只支持通过百分位数和rank进行select，这并不符合直觉，最简单且最常用的方法应该是根据某个字段的值域进行选择，比如相似度大于某个阈值，PPL小于某个阈值等，本次PR支持这一功能。
此外，原来的process函数在逻辑判断时存在一定的问题（不支持某些情况下的缺省），lower_percentile和lower_rank不能同时为None，upper_percentile和upper_rank也不能同时为None，否则就不会进行select，这不适用于只有上界或者只有下界的情况，本次PR针对这一逻辑进行了优化。