Add a command to import configuration

Problem/Motivation

Part of #3582246: [meta] CLI in Core community initiative. Referenced from theCLI in Core Initiative spreadsheet.

Steps to reproduce

To be determined.

Proposed resolution

To be determined.

Remaining tasks

Determine manual testing steps for this command.

User interface changes

To be determined.

Introduced terminology

To be determined.

API changes

To be determined.

Data model changes

To be determined.

Release notes snippet

To be determined.