[FLINK-3243] Fix Interplay of TimeCharacteristic and Time Windows
This adds dedicated WindowAssigners for processing time and event time. timeWindow() and timeWindowAll() respect the TimeCharacteristic set on the StreamExecutionEnvironment. This will make the easy stuff easy, i.e. using time windows and quickly switching the time characteristic. Users will then have the flexibility to mix different kinds of window assigners in their job. This also expands the translation tests to verify that the correct window operators are instantiated.
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