[chore]: Refactor files and jobs into proper folders

[zFernand0]

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

Before the Python SDK reaches the Long Term Support stage, we should split the service (files and jobs) SDKs into folders based on their functionality.

Describe your enhancement idea

Ideally we would have a structure similar to this:

Describe alternatives you've considered

N/A

Provide any additional context

For details, see the zowe-files-sdk for Nodejs:

• https://github.com/zowe/zowe-cli/tree/master/packages/zosfiles/src/methods

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