[FLINK-39401][formats] Port raw line-delimiter option to release-1.15#28048

featzhang wants to merge 3 commits intoapache:release-1.15apache/flink:release-1.15from

featzhang:feature/FLINK-39401-raw-line-delimiterfeatzhang/flink:feature/FLINK-39401-raw-line-delimiterCopy head branch name to clipboard