[Feature][Connector-V2] Jdbc DB2 support upsert SQL

[shashwatsai]

Purpose of this pull request

Currently Seatunnel JDBC Connector with DB2 Dialect, does not support upsert scenarios, as the implementation is unavailable. While analysing our requirements within Visa's use-cases, we have approximately 60% of jobs that heavily depend on this.

We want to introduce the implementation for upsert support for DB2 dialect, along with the e2e Integration test case.

solves: #4434, as Dameng DB, implementation is already present.
How do I reopen the issue?

Does this PR introduce any user-facing change?

No,
User does not have to provide the query parameter in sink, user has to provide database, table and generate_sink_sql, which are already available in the configurations. Please refer corresponding [Seatunnel-web] PR: apache/seatunnel-web#233

Sample:

env {
  parallelism = 1
  job.mode = "BATCH"
}

source {
  # This is a example source plugin **only for test and demonstrate the feature source plugin**
  Jdbc {
    driver = com.ibm.db2.jcc.DB2Driver
    url = "jdbc:db2://db2-e2e:50000/E2E"
    user = "db2inst1"
    password = "123456"
    query = """
    select * from "E2E".SOURCE;
    """
  }
}

sink {
  Jdbc {
    driver = com.ibm.db2.jcc.DB2Driver
    url = "jdbc:db2://db2-e2e:50000/E2E"
    user = "db2inst1"
    password = "123456"
    database = "E2E"
    table = "SINK"
    # The primary keys of the table, which will be used to generate the upsert sql
    generate_sink_sql = true
    primary_keys = [
      C_INT
    ]
  }

How was this patch tested?

We internally deployed, and tested the scenarios, we need to introduce a minor change in Seatunnel-web module as well, to delegate generation of sink sql to the engine, as required for the upsert use-case.

Check list

• 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/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Hisoka-X]

Thanks @shashwatsai , LGTM just except one minior problem.

[Hisoka-X]

Please force set enable_upsert to true to avoid the test case broken when the default value changed.

[Hisoka-X]

LGTM if ci passes. Thanks @shashwatsai !

[shashwatsai]

@Hisoka-X , thanks for your time in reviewing the same.

@hailin0 , @liugddx, @arshadmohammad can you please help with the review.

[arshadmohammad]

LGTM +1