Runnable Java examples

Copy-paste sources linked from java/examples.html.

• CdcBoundaryExample.java
• CookbookTransformsExample.java
• DataFrameCentricPipeline.java
• DbReadPipelineExample.java
• DeltaLakeHandoff.java
• ExcelSnippets.java
• ExecutionEngineNoteExample.java
• ExportFilterRowsMaxUtf8Chars.java
• ExportJsonlTrainTest.java
• GhcnJsonXmlParquetPipeline.java
• GroupByAggregatesExample.java
• InferredSchemaIngestExample.java
• IngestObservabilityExample.java
• IngestValidateJsonlEndToEnd.java
• JsonParquetExcelSnippets.java
• KafkaEltLoadExample.java
• KafkaEltStreamExample.java
• MedianReduceAndDataFrame.java
• ObjectStoreUrlsExample.java
• OrderedPaths.java
• OutlierDetectionExample.java
• ParquetSnippets.java
• PartitionDiscoveryExample.java
• PathFromDirectoryScan.java
• PlatformConnectorsPipelineExample.java
• PrivacyDiffReports.java
• ProcessingReduceExample.java
• ProfilingExample.java
• QuickStartIngestExample.java
• RDPOnlyETLExample.java
• ReportsTruncateUtf8.java
• SQLQueries.java
• SftpFtpConnectorsExample.java
• SparkParquetHandoffExample.java
• SqlJoinPipelineExample.java
• TransformUtf8Masking.java
• ValidationUtf8Length.java
• WarehouseExportHandoffExample.java