Resolves bug due to name issues of the data roles on Chart

[gillisce]

In this PR I remove the use of DataRoles tied to the chart type and use the Data Role Names instead, this resolves an error I noticed when the recent update came out in June of 2022. The dataroles the showcase uses were outdated due to the updates made to Power BI. By leveraging the Data Role Names the showcase is able to run and allow users to test out creating their own visuals

Closes #4

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