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[SPARK-23765][SQL] Supports custom line separator for json datasource
## What changes were proposed in this pull request? This PR proposes to add lineSep option for a configurable line separator in text datasource. It supports this option by using `LineRecordReader`'s functionality with passing it to the constructor. The approach is similar with #20727; however, one main difference is, it uses text datasource's `lineSep` option to parse line by line in JSON's schema inference. ## How was this patch tested? Manually tested and unit tests were added. Author: hyukjinkwon <gurwls223@apache.org> Author: hyukjinkwon <gurwls223@gmail.com> Closes #20877 from HyukjinKwon/linesep-json.
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