[SPARK-39689][SQL] Support 2-chars `lineSep` in CSV datasource #154

Job	Run time
Configure jobs	1s
Check changes	36s
Linters, licenses, dependencies and documentation generation	1m 16s
Build modules (${{ format('{0}, {1} job', needs.configure-jobs.outputs.branch, needs.configure-jobs.outputs.type) }}): ${{ matrix.modules }}	0s
Build modules (${{ format('{0}, {1} job', needs.configure-jobs.outputs.branch, needs.configure-jobs.outputs.type) }}): ${{ matrix.modules }} ${{ matrix.comment }} (JDK ${{ matrix.java }}, ${{ matrix.hadoop }}, ${{ matrix.hive }})	0s
Java ${{ matrix.java }} build with Maven	0s
Run Docker integration tests	0s
Scala 2.13 build with SBT	0s
Build modules: sparkr	0s
Run TPC-DS queries with SF=1	0s
	1m 53s

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