Install wizard configmgr file handling

[1000TurquoisePogs]

Configmgr supports having multiple yaml files and that they can be in parmlib or unix.
But, the zwe init steps that the install wizard uses doesnt use configmgr, limiting this approach.

When zwe can handle it, the install wizard should likewise handle loading multiple yamls, and saving the zowe yaml configuration to one or more parmlib/files.

How would we visualize multiple yamls? With tabs! Make the editor have a tab interface with a plus button to add a new one, and a filename that allows them to put to unix or parmlib.

There could even be an option somewhere (last tab? different page? button?) which will merge all the yaml files together so the user can view/preview what zowe would actually use at runtime.

the install wizard could even handle configmgr template resolution preview.
Much of the logic for doing so is already in JS code, here https://github.com/zowe/zlux-server-framework/blob/v2.x/staging/utils/yamlConfig.ts

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1. Option for YAML in PARMLIB #220
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