[Sheets] Named Single Sheet

As a developer, I would like to be able to reference single sheets by the name of the sheet tab so I can use sheets the same way I do on SharePoint.

## Context
Below is the format for single sheet. As you can see, Helix likely has no reference point if we were to change the name of the `data` property. That being said, we should at least look into this to get closure.

```json
{
"total": 159,
"offset": 0,
"limit": 159,
"data": [
{
"key": "add-30-day-stock-trial",
"value": "Add a 30-day free trial of Adobe Stock.*"
}
],
"columns": [
"key",
"value"
],
":type": "sheet"
}

Start by tracing the single-sheet JSON response shown in the issue and identify where the `data` property and sheet-tab name are handled. Determine the compatibility requirements for referencing a sheet by its tab name, then verify that the resulting behavior supports the stated SharePoint-style use case without leaving the `data` property question unresolved.

Written by the indexing model from the issue text.