[FLINK-22475][table-common][table-api-java-bridge] Provide placeholder options (.'#'.) for datagen connector#15896

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Airblader:FLINK-22475

Commits on May 11, 2021

[FLINK-22475][table-common] Document usage of '#' placeholder in option keys
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[FLINK-22475][table-common] Exclude options with '#' placeholder from validation of required options
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Commits on May 12, 2021

[FLINK-22475][table-api-java-bridge] Add placeholder options for datagen connector
Airblader
committed