Add import export shellspec test matrix

[ethanholen-hpe]

Summary and Scope

• Adds a shell-spec test to the functional test suite to validate that the import and export work to and from each of the providers.
• Along with a new flag datastore-path to set the canidb.json path for a single command.

Risks and Mitigations

• No risk only testing

[ethanholen-hpe]

Adding some potential future avenues of testing for this PR that I thought about when making these tests:

• It may be helpful to standardize on the data that is getting moved around in this test.
  • Eg. the current data files that are getting imported and exported are simply random json or csv files that I pulled from the example data. It may be easier to maintain going forward
• It may also be helpful to have a docs page for adding new tests (maybe in the example provider somewhere) any time that someone adds a new provider, since this matrix could potentially be helpful to illustrate current provider functionality as well as providing quick and easy functionality tests for new providers