Remove pulsar sink support

[Rustin170506]

Pulsar is in an unmaintained state, with no unit tests, no integration tests, and no support for new features. So we decided to remove it.

StreamNative officially provides Kafka-on-Pulsar (https://github.com/streamnative/kop) to give Pulsar the ability to support the native Kafka protocol, so the TiCDC Kafka Sink can write data to Pulasr with the power of kop. .

[Jiangrb]

@hi-rustin

After integrating the kop, the ticdc does not work, and the prompt the error blow :

Error: [CDC:ErrKafkaNewSaramaProducer]new sarama producer: [CDC:ErrKafkaBrokerConfigNotFound]cannot find the `message.max.bytes` from the broker's configuration

I can not found anywhere to config the property of message.max.bytes in kop , so I tried to find the code that describing the config of kafka in kop ,then I found the method 'describeConfigsAsync' in this link kop AdminManager.java

It seems that kop does not return the value of the attribute to message.max.bytes, but Ti-CDC required it

[Jiangrb]

Finally , I modified the code in this AdminManager.java and rebuilded kop, then it works !

that's what I added :

[Kevinzhuo]

Finally , I modified the code in this AdminManager.java and rebuilded kop, then it works !

that's what I added :

@Jiangrb
I added message.max.bytes, but ticdc still reports this error. Is there any other way to solve it?

[reAsOn2010]

I think Pulsar is actively maintained now？ https://github.com/apache/pulsar/actions

[Rustin170506]

I think Pulsar is actively maintained now？ https://github.com/apache/pulsar/actions

I meant pulsar sink.