Add CLI command to validate scenario data file from definitions

[dc-almeida]

First step towards #404

[phackstock]

Nice addition @dc-almeida (sorry for jumping in here with a review).
Couple of comments in line below.

[dc-almeida]

Thanks for the hawk-eye as always!

[phackstock]

Thanks for the hawk-eye as always!

You're welcome, always easier to spot these things in other people's work :D

[phackstock]

Thanks for the quick changes @dc-almeida.
Good to be merged from my side, in principle.
However, as mentioned in #419, I think the name of the command might be misleading and I think it should include an option to specify the dimensions that should be validated.

[danielhuppmann]

Thank you!

[phackstock]

Before we go ahead with the merge if I understood our discussion in #419 correctly, this PR is still missing a dimensions option so that you can specify which dimension you want to validate, correct @danielhuppmann?

[danielhuppmann]

I have a suggestion: we merge as is, and then @dc-almeida does a follow-up PR adding the dimensions for this CLI, and also extending the tests for the validate-scenario and validate-project to make sure that all three cases work as expected:

• explicit dimensions argument (this is currently tested in test_cli_custom_dimensions_runs())
• if not given, use dimensions argument set from nomenclature.yaml (not sure if this is tested)
• if also not given, check all available folders

[phackstock]

Sounds good to me.