Uplink "import" command

[azdagron]

What:

• import command to import a scope from a file.
• Added an --export-to flag to the share command to export a scope that can be imported
• Added a way to mark a flag so that it is visible, yet does not persist in the configuration file (i.e. "flag" source)

Why:
Lights up previously added capability for uplink to utilize different scopes by allowing scopes to be exported and imported.

Please describe the tests:
None. There is no existing unit test infrastructure for the CLI commands. The commands were tested manually. Adding CLI unit-test infrastructure is outside the scope of this PR and can be addressed in a follow up PR.

Please describe the performance impact:
N/A

Code Review Checklist (to be filled out by reviewer)

• Does the PR describe what changes are being made?
• Does the PR describe why the changes are being made?
• Does the code follow our style guide?
• Does the code follow our testing guide?
• Is the PR appropriately sized? (If it could be broken into smaller PRs it should be)
• Does the new code have enough tests? (every PR should have tests or justification otherwise. Bug-fix PRs especially)
• Does the new code have enough documentation that answers "how do I use it?" and "what does it do?"? (both source documentation and higher level, diagrams?)
• Does any documentation need updating?
• Do the database access patterns make sense?