samples: add Java samples

[anweshan]

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[snippet-bot]

Here is the summary of changes.

You are about to add 11 region tags.

• samples/snippets/src/main/java/com/example/analytics/GetCommonMetadataSample.java:31, tag analyticsdata_get_common_metadata
• samples/snippets/src/main/java/com/example/analytics/GetCommonMetadataSample.java:67, tag analyticsdata_print_get_metadata_response
• samples/snippets/src/main/java/com/example/analytics/GetMetadataByPropertyIdSample.java:31, tag analyticsdata_get_metadata_by_property_id
• samples/snippets/src/main/java/com/example/analytics/RunBatchReportSample.java:35, tag analyticsdata_run_batch_report
• samples/snippets/src/main/java/com/example/analytics/RunPivotReportSample.java:35, tag analyticsdata_run_pivot_report
• samples/snippets/src/main/java/com/example/analytics/RunPivotReportSample.java:99, tag analyticsdata_print_run_pivot_report_response
• samples/snippets/src/main/java/com/example/analytics/RunRealtimeReportSample.java:34, tag analyticsdata_run_realtime_report
• samples/snippets/src/main/java/com/example/analytics/RunRealtimeReportSample.java:76, tag analyticsdata_print_run_realtime_report_response_header
• samples/snippets/src/main/java/com/example/analytics/RunRealtimeReportSample.java:88, tag analyticsdata_print_run_realtime_report_response_rows
• samples/snippets/src/main/java/com/example/analytics/RunRealtimeReportWithMultipleDimensionsSample.java:34, tag analyticsdata_run_realtime_report_with_multiple_dimensions
• samples/snippets/src/main/java/com/example/analytics/RunRealtimeReportWithMultipleMetricsSample.java:34, tag analyticsdata_run_realtime_report_with_multiple_metrics

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[averikitsch]

Thank you for the PR, but it is very large. Can you please split it into different PRs? Take a look at go/cdpe-snippet-rubric and https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md to add thorough comments to the samples. Please use exec:exec not exec:java see GoogleCloudPlatform/java-docs-samples#1523

[anweshan]

@averikitsch how many samples would you like per PR? I can split up the work done in this one

[averikitsch]

@averikitsch how many samples would you like per PR? I can split up the work done in this one

Thank you, can you separate max 3 samples per PR?

[anweshan]

Closing PR as content is duplicated in smaller PRs