[FLINK-17636][tests] Fix unstable test SingleInputGateTest#testConcurrentReadStateAndProcessAndClose

This closes #12894

This closes #12896

This closes #12856

This closes #11161

This closes #12885

[FLINK-18440][table-planner-blink] ROW_NUMBER function: ROW/RANGE not allowed with RANK, DENSE_RANK or ROW_NUMBER functions

This closes #12868

[FLINK-18539][datastream] Fix StreamExecutionEnvironment#addSource(SourceFunction, TypeInformation) doesn't use the user defined type information 

This closes #12877

This closes #12889

This closes #12884.

This closes #12748

This closes #12794

This closes #12855.

[FLINK-18561][python] Build manylinux1 with better compatibility instead of manylinux2014 Python Wheel Packages

This closes #12869.

This makes AvroFactory and the used method public where they were
package private before.

This fixes the problem that AvroDeserializationSchema was not working
with types generated from avrohugger. It could also just be seen as
refactoring/code cleanup.

This fix the unstable test with "Topic 'changelog_topic' already exists" exception

This closes #12857.

This closes #12853.

[FLINK-18502][FLINK-18505][docs] Add the missing 'legacySourceSinks.zh.md' page and synchronize content of 'sourceSinks.zh.md'

This closes #12854

The right exception should be `org.apache.kafka.common.KafkaException` instead of `kafka.common.KafkaException`

At least the "numTries" exception should be thrown instead of the binding exception.

This closes #12845.