(#3381) Add new rule command

[AdmiringWorm]

Description Of Changes

This adds a new command called ´rulewith an alias ofrules` to be able to view any Validation Rules that have been implemented by Chocolatey CLI, or the details of a specific view.

Motivation and Context

To give visibility to users an what will happen/validated when they package their Chocolatey CLI package, as well intended enhanced functionality that will be implemented outside Chocolatey CLI that can reuse this same command.

Testing

1. Run choco rules (also try choco rule list). You should then see something similar to
   
2. Run choco rule get --name CHCR0002. You should then see something similar to
   (_repeat with choco rule CHCR0002)
3. Run choco rules -r. You should then see something similar to
   
4. Run choco rule --name missing. You should see something similar to
5. Run choco rule get --name missing. You should see something similar to
6. Run choco rule get --name CHCR0001 -r. You should see something similar as point 3, with just the specified rule outputted.
7. Run choco rule get --name missing -r. No rules should be outputted, and no error occurring.

Operating Systems Testing

• Windows 10

Change Types Made

• [ ] Bug fix (non-breaking change).
• [x] Feature / Enhancement (non-breaking change).
• [ ] Breaking change (fix or feature that could cause existing functionality to change).
• [ ] Documentation changes.
• [ ] PowerShell code changes.

Change Checklist

• [x] Requires a change to the documentation.
• [ ] Documentation has been updated.
• [x] Tests to cover my changes, have been added.
• [x] All new and existing tests passed?
• [ ] PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

Fixes #3381

[gep13]

@AdmiringWorm overall, this looks really good, and would be happy to get this merged in.

While reviewing, I did make some changes, which I have added as a standalone commit. Let's have a chat about the changes tomorrow, and decide whether to move forward with them.

[gep13]

@AdmiringWorm and I met today, and during a pairing session decided that the suggested changes make sense. These have now been rebased into the existing commits, and will continue with the merge, once the CI builds pass.