Enhancement: PTable

[znicholasbrown]

This PR makes several improvements to PTable, including:

• adding a border to that matches the row divider
• removing the p-background class from PTableHead
• tightening row and header vertical padding
• expanding column definitions to include min and max attributes; these help us better enforce column width definitions and prevent table blowouts
• truncating headers and cells
• adding title attributes to headers and cells
• swapping font-semibold for font-bold in header labels (semibold text doesn't provide a very clear distinction between headers and content)

Before:

After:

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[znicholasbrown]

Because of the way these slots are implemented, these title attributes will always work off the passed label and won't display any custom content - I think this is fine but open to pushback if that's not a clear devex.