Adding attributes to core.summary methods

Describe the enhancement
Adding an additional attributes parameter to all the methods in the Summary class that add an HTML element to the summary buffer. This attributes parameter would be used to add HTML attributes to customize the created HTML element.

Code Snippet

core.summary.addDetails("Summary", {open: true, style: "font-size:20px;"});

The above piece of code would create a details tag which is by default open and all the text in it has a font size of 20px

Additional information
It seems that this functionality is pretty much implemented by the private wrap method. We just have to add the attributes parameter to the public methods and pass it down to wrap. For addTable we can add the attributes as a field in SummaryTableCell instead.
Related issues: #1146, #1090

Start in packages/core/src/summary.ts, especially the private wrap method and the public Summary methods that add HTML elements. Trace addTable and SummaryTableCell as well. Done means the relevant public methods accept and pass attributes through, while table cells can provide attributes and the generated HTML supports the documented example.