[jira] [Created] (FLINK-15131) Add Source API classes

[Shang Yuanchun (Jira)]

Jiangjie Qin created FLINK-15131:
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             Summary: Add Source API classes
                 Key: FLINK-15131
                 URL: https://issues.apache.org/jira/browse/FLINK-15131
             Project: Flink
          Issue Type: Sub-task
            Reporter: Jiangjie Qin


Add all the top tier classes defined in FLIP-27.

[https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface#FLIP-27:RefactorSourceInterface-Toplevelpublicinterfaces]



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