[I] [Feature][seatunnel-config] connection configuration uniform and reuse in job config [seatunnel]

[via GitHub]

thirsd opened a new issue, #8941:
URL: https://github.com/apache/seatunnel/issues/8941

   ### Search before asking
   
   - [x] I had searched in the 
[feature](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22Feature%22)
 and found no similar feature requirement.
   
   
   ### Description
   
   支持连接配置统一管理和引用，方便配置复用和配置在开发和线上分离
   
   connection configuration
   
   I hope to maintain the connection configuration information uniformly and 
reference it in the Job configuration by using the conn_id method, thereby 
achieving the reuse of connection information and facilitating the decoupling 
of the test environment and the online environment.
   
   example:
   connection.conf
   `connection {
     # 定义 MySQL 连接配置
     mysql_prod {
       url = "jdbc:mysql://localhost:3306/test"
       driver = "com.mysql.cj.jdbc.Driver"
       connection_check_timeout_sec = 100
       user = "root"
       password = "123456"
       fetch_size = 10000
     }
   
     # 定义 Kafka 连接配置
     kafka_test {
       bootstrap.servers = "kafka-test:9092"
       topic = "test_topic"
     }
     
     sqlite_test {
       url = 
"jdbc:sqlite:D://MyWorld/05Projects/java/Seatunnel/SeaTunnel/db/test.db"
       driver = "org.sqlite.JDBC"
       connection_check_timeout_sec = 100
       user = "root"
       password = "123456"
       fetch_size = 10000
     }
   }
   `
   
   in job config, i can use conn_id to replace connect config.
   `env {
     parallelism = 1
     job.mode = "BATCH"
   }
   
   source {
     Jdbc {
       conn_id = "sqlite_test"
       query="select * from department"
     }
   }
   
   transform {
   }
   
   sink {
     console {
     }
   }`
   
   
   
   ### Usage Scenario
   
   _No response_
   
   ### Related issues
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [x] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [x] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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