[frankgiordano]

This PR implements the Change Job Class REST API in the zowe.client.sdk.zosjobs.methods package, providing users of the Java SDK with the ability to change the class of a JES job via the z/OSMF REST interface. The implementation follows the existing style and design patterns used in other job-related methods such as JobCancel, JobHold, and JobRelease.

The API wraps the z/OSMF Change Job Class endpoint documented here:
https://www.ibm.com/docs/en/zos/2.4.0?topic=interface-change-job-class

What’s Included:

• A new class JobChange in the zosjobs.methods package

  • Follows the validation, logging, and request construction conventions from existing classes (e.g., JobCancel)
  • Supports both synchronous (version = "2.0") and asynchronous (version = "1.0") invocation
  • Validates jobName, jobId, and jobClass parameters
  • Constructs a PUT request to the /zosmf/restjobs/jobs/{jobname}/{jobid} endpoint with the proper JSON body to change job class
  • Uses ZosmfRequest and ZosmfRequestFactory to ensure consistent HTTP handling
  • Added constants to JobsConstants as needed

Example Usage

 JobChange jobChange = new JobChange(connection);
 Job job = jobChange.change("MYJOB", "00012345", "A", "2.0");

This will send a request to change the class of job MYJOB/00012345 to class "A" synchronously.

Implements #381