Implement type completions & validation for resource list functions

[anthony-c-martin]

Changes

• Add in types for resource list functions (types PR: Add support for list action type definitions bicep-types-az#301).
• Add completions for function arguments.
• Modify function resolution logic to pick non-wildcard functions over wildcard functions when ambiguous.

Limitations

• list function completions are only offered for API versions matching the API version used for the resource. Wildcard functions are still supported as a fallback, but will lack type information.
• It's somewhat opaque to users what properties are available inside a named object parameter, especially in situations where they haven't been marked as required. This problem exists generally in Bicep, so I haven't tried to solve it with this PR.

Demo

Screen.Recording.2021-11-15.at.8.08.30.PM.mov

[majastrz]

It's really neat that this brings in type checking for things like this:

Although, we should call out in our release notes that the additional validation done by this may produce errors that weren't logged previously. (In cases of swagger inaccuracies.)

[majastrz]

IndexOf

Would it make sense to put this type computation logic in the DeclaredTypeManager and only retrieve here?

[majastrz]

This is great! Added a minor question.