Add encoding support to zowe files search ds command

[awharn]

Is your feature or enhancement request related to a problem or limitation? Please describe

There is no way to provide an encoding to the zowe files search ds command. If all of my data-sets and members are not in the standard IBM-1047 encoding, then I cannot search them.

Describe your enhancement idea

Pass on the encoding option in on SearchOptions.GetOptions.encoding in the CLI handler. The API should handle the rest.

Describe alternatives you've considered

Provide any additional context

[github-actions]

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