[api-draft][connector] apache pulsar source

[ashulin]

Purpose of this pull request

apache pulsar source

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/incubator-seatunnel/tree/dev/docs

[Hisoka-X]

Please add license to LICENSE file in seatunnel-dist

[Hisoka-X]

Also add pulsar connector into pom.xml in seatunnel-connector-seatunnel-dist

[ashulin]

@benjfan I have added the licenses.

[CalvinKirs]

Some Notices also need to be added. https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-dist/release-docs/NOTICE

[ashulin]

@CalvinKirs Do I need to add any licenses or notices?

[wachoo]

I run this command with the jar "connector-pulsar-2.3.3.jar"

./bin/seatunnel.sh --config ./config/v2.streaming.pulsar2console.template -e local

the connection to admin and client is ok, but it can not consume the messages .

the connection configuration below like this:

env {
    "job.mode"=STREAMING
    "job.name"="seatunnel_schema2console_test"
}
source {
    Pulsar {
        "subscription.name"="seatunnel_schema2console_test.sub"
        "cursor.startup.mode"=LATEST
        "cursor.reset.mode"=null
        "cursor.stop.mode"=NEVER
        "topic-discovery.interval"=-1
        "poll.timeout"=100
        "poll.interval"=50
        "poll.batch.size"=500
        parallelism=1
        "result_table_name"=Table11621381770080
        topic="persistent://public/default/seatunnel.schema.test"
        schema {
            fields {
                id=string
            }
        }
        operationTimeoutMs="30000"
        useTls="false"
        connectionMaxIdleSeconds="30000"
        useTcpNoDelay="true"
        "client.service-url"="pulsar://xxx.xxx.xxx.xxx:6650"
        "admin.service-url"="http://xxx.xxx.xxx.xxx:8080"
        topic-pattern="false"
        lookupTimeoutMs="30000"
        tlsHostnameVerificationEnable="true"
    }
}
transform {
}
sink {
    Console {
    }
}

is there some demo for pulsar?