fix(chip): add toolbar role

[bennypowers]

Closes #2666

What I did

1. added toolbar role to shadow container for chip group
2. some nitpicky formatting

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Latest commit: 02e20e9756860816e18097cd10bdd388d3b812b5

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[hellogreg]

Running some tests in the preferred desktop browser screen reader combos...

Windows Chrome and JAWS: All good

Mac Safari and VoiceOver: All good

Windows Firefox and NVDA: Looks like there's a keyboard navigation issue in Windows and Mac Firefox, even before trying with a screen reader. This issue is also present in the current live version of chip, so I can make a separate issue for it this afternoon. (Basically, if you tab to a chip group and then try using the arrows, you can't navigate between the regular chips in that group. However, if you hit the arrow key enough times, you will navigate to the "x more / see less" chip.)

That said, everything regarding chip that is keyboard navigable in FF looks to be working well with NVDA.

So, I guess what I'm saying is this issue looks good to me, but I can't really test Firefox fully, because keyboard nav isn't totally working.

[hellogreg]

Added the Firefox issue: #2682