Dataset creation API and Desktop UI

[1000TurquoisePogs]

Add an API to ZSS which allows a user to create a dataset when the client provides defaults or fully specified dataset parameters. Make a panel in the file tree component used by the Desktop Editor and open for use by others which would present a dialogue for setting those parameters or using the defaults. Immediate end user result would be the ability to create datasets from the Desktop Editor.

[1000TurquoisePogs]

API WIP at zowe/zowe-common-c#244 and zowe/zss#351

[1000TurquoisePogs]

WIP work is fully functional for doing a dataset & member allocation.
But certain combinations arent supported yet such as

• Wrong DISP would fail (we just shouldnt support DISP customization)
• Can't specify extent size/count yet
• Can't customize unit size yet (blk, cyl, byte)

[1000TurquoisePogs]

UI WIP at zowe/zlux-file-explorer#144

[1000TurquoisePogs]

Because you can't create a VSAM through the API being used, its implied this doesnt support VSAM but I guess we could document it somewhere? Not sure, it may be obvious that its not supported.

[1000TurquoisePogs]

Can be closed when https://github.com/zowe/zlux-file-explorer/pull/170is merged.