Verify jcl input

[1000TurquoisePogs]

The JCL in SAMPLIB can be run without intervention of zwe.
Some find this great, but currently zwe is the tool that can verify if the input to the JCL is even valid.

Further, #3634 wishes to move all JCL logic out of zwe, which previously would do validation before job submission. Without further action, we'd move from users not being able to use all our JCL, to users having no validation. We must have both JCL and validation.

I suggest using "configmgr-rexx", which is a tool currently in Zowe that can be used to read zowe.yaml from within rexx, and invoke schema validation upon it.

With configmgr-rexx, we could:

• Reduce the amount of input to the JCL needed. Parameters can come directly from zowe.yaml
• Verify the input before executing any system alterations

We don't NEED to get the parameters from zowe.yaml, if someone finds that bad, but if we don't then we have the problem of users typing information in twice, so I think its preferred.

The main goal though is to ensure that the JCL do not continue before verifying user input is okay.