ZE download data set/USS commands

[JWaters02]

Describe your pull request here: Docs for Zowe Explorer download data sets and USS commands. To be released with ZE 3.5.0

List the file(s) included in this PR:
docs\user-guide\ze-working-with-data-sets.md
docs\user-guide\ze-working-with-uss-files.md

Waiting on zowe/zowe-explorer-vscode#3843 and when it is merged I will update this docs PR with any other changes.

[github-actions]

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[github-actions]

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