feat(dataframe): Column variable support

[cameronwaterman]

Pull Request

🤨 Rationale

https://ni.visualstudio.com/DevCentral/_workitems/edit/2566754

👩‍💻 Implementation

• Added variable support to query editor columns field.
• Added variable query editor to data frame data source that displays a table id field. This field also supports variables. Implemented metricFindQuery to return the selected tables columns.
• Since the data frame query editor and variable query editor shared the majority of their logic, this was split out to a helper class that is accessed by both.

🧪 Testing

• Verified functionality locally
• Added new tests and existing tests continue to pass

✅ Checklist

• This PR has a title that follows the commit message format.

[cameronwaterman]

@mure - This should be good to go again. The merge was pretty nasty so make sure you give it another look.

[cameronwaterman]

@mure - Submitting this since teams is showing you as OOO and so Josh can start playing with it. If you have responses to those two comments I can address them in a separate PR.

[mure]

🎉 This PR is included in version 3.9.0 🎉

The release is available on:

• v3.9.0
• GitHub release

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