DataList - implement full page Basic demo to match HTML

[nicolethoen]

Add a demo to the DataList React demos tab which matches the Basic demo under the HTML Demos tab.

• It does not need to implement working pagination or filtering - the toolbar at the top of the DataList is for context, so it does not need to be fully functional
• The Page layout and scaffolding is extremely similar to that of the Card View React demo (code found here). The primary difference is the presence of Cards in the card view demo and DataList in the DataList demo.
• The DataList items should match as closely as possible to the corresponding HTML Demo
• The source branch for the issue work should be patternfly-react's V5 branch, and that is also the branch your code should merge back into.
• It will likely be necessary to move the DataListDemo.md file into a directory much like the CardView demo is in a Card directory under demos.

[Kells512]

Hello, I think I had to comment here about taking on the task