[BK-1.15][FLINK-28972][python][connector/pulsar] Align source and sink class to java

[a49a]

What is the purpose of the change

Backport master to release-1.15

Brief change log

• Add python pulsar sink to align with java
• Align the python source method to java

Verifying this change

• Added python pulsar sink test cases
• Added source StopCursor test cases

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (yes)
• If yes, how is the feature documented? (docs)

[flinkbot]

CI report:

• f5049524b3834eb110808b592f30c1a61fd25085 Azure: FAILURE

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[dianfu]

Closed as it should already been supported.