chore(ButtonGroup): add Button Group Behavior

[assuncaocharles]

Pull request checklist

• Addresses an existing issue: Fixes #0000
• Include a change request file using $ yarn change

Description of changes

Currently we have no behavior for ButtonGroup. This PR adds the behavior and add aria-role=group to the group.

Focus areas to test

(optional)

Microsoft Reviewers: Open in CodeFlow

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 41a20a00826b63bed8fab41116cb88eabf3722ff (build)

[msft-github-bot]

Perf Analysis

No significant results to display.

All results

Scenario	Master Ticks	PR Ticks	Iterations	Status
BaseButton	818	840	5000
Checkbox	1579	1596	5000
CheckboxBase	1363	1337	5000
ChoiceGroup	4998	5070	5000
ComboBox	882	902	1000
CommandBar	7038	7307	1000
ContextualMenu	12871	13251	1000
DefaultButton	1004	1017	5000
DetailsRow	3341	3247	5000
DetailsRow (fast icons)	3203	3353	5000
DetailsRow without styles	3162	3125	5000
Dialog	1299	1435	1000
DocumentCardTitle with truncation	1510	1439	1000
Dropdown	2311	2221	5000
FocusZone	1521	1545	5000
IconButton	1627	1654	5000
Label	295	319	5000
Link	459	458	5000
MenuButton	1445	1435	5000
Nav	2998	3132	1000
Panel	1419	1442	1000
Persona	829	805	1000
Pivot	1319	1310	1000
PrimaryButton	1153	1234	5000
SearchBox	1236	1252	5000
Slider	1450	1444	5000
Spinner	378	349	5000
SplitButton	3002	3005	5000
Stack	486	460	5000
Stack with Intrinsic children	1097	1140	5000
Stack with Text children	4152	4217	5000
TagPicker	2623	2489	5000
Text	326	366	5000
TextField	1261	1313	5000
Toggle	868	804	5000
button	60	57	5000

Perf Analysis (Fluent)

Perf comparison

Status	Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
🔧	Avatar.Fluent	0.48	0.47	1.02:1	2000	967
🦄	Button.Fluent	0.11	0.2	0.55:1	5000	550
🔧	Checkbox.Fluent	0.69	0.35	1.97:1	1000	686
🔧	Dialog.Fluent	0.35	0.21	1.67:1	5000	1748
🔧	Dropdown.Fluent	3.09	0.43	7.19:1	1000	3092
🔧	Icon.Fluent	0.15	0.05	3:1	5000	731
🦄	Image.Fluent	0.07	0.11	0.64:1	5000	365
🔧	Slider.Fluent	1.33	0.34	3.91:1	1000	1334
🔧	Text.Fluent	0.07	0.02	3.5:1	5000	354
🦄	Tooltip.Fluent	0.09	17.11	0.01:1	5000	449

🔧 Needs work     🎯 On target     🦄 Amazing

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
HeaderMinimalPerf.default	549	440	1.25:1
PopupMinimalPerf.default	271	234	1.16:1
ChatMinimalPerf.default	658	591	1.11:1
ChatDuplicateMessagesPerf.default	422	384	1.1:1
TreeMinimalPerf.default	1311	1197	1.1:1
TableMinimalPerf.default	432	397	1.09:1
FormMinimalPerf.default	821	761	1.08:1
EmbedMinimalPerf.default	2007	1876	1.07:1
GridMinimalPerf.default	716	671	1.07:1
ButtonMinimalPerf.default	174	164	1.06:1
IconMinimalPerf.default	717	679	1.06:1
AttachmentMinimalPerf.default	141	134	1.05:1
ChatWithPopoverPerf.default	585	556	1.05:1
DialogMinimalPerf.default	1761	1679	1.05:1
RefMinimalPerf.default	210	200	1.05:1
HeaderSlotsPerf.default	1554	1495	1.04:1
ListMinimalPerf.default	490	470	1.04:1
ProviderMergeThemesPerf.default	1548	1486	1.04:1
SplitButtonMinimalPerf.default	3499	3367	1.04:1
ItemLayoutMinimalPerf.default	1763	1706	1.03:1
AttachmentSlotsPerf.default	1115	1094	1.02:1
ButtonSlotsPerf.default	630	617	1.02:1
DividerMinimalPerf.default	699	685	1.02:1
FlexMinimalPerf.default	279	274	1.02:1
Checkbox.Fluent	686	672	1.02:1
Slider.Fluent	1334	1309	1.02:1
ListNestedPerf.default	927	919	1.01:1
ListWith60ListItems.default	1181	1169	1.01:1
SegmentMinimalPerf.default	972	967	1.01:1
ToolbarMinimalPerf.default	1107	1095	1.01:1
Tooltip.Fluent	449	446	1.01:1
DropdownManyItemsPerf.default	1291	1291	1:1
HierarchicalTreeMinimalPerf.default	970	972	1:1
ListCommonPerf.default	1023	1018	1:1
ReactionMinimalPerf.default	1910	1908	1:1
StatusMinimalPerf.default	716	716	1:1
TreeWith60ListItems.default	230	230	1:1
VideoMinimalPerf.default	662	661	1:1
Icon.Fluent	731	729	1:1
AnimationMinimalPerf.default	638	647	0.99:1
CardMinimalPerf.default	571	576	0.99:1
CarouselMinimalPerf.default	576	584	0.99:1
InputMinimalPerf.default	992	998	0.99:1
LabelMinimalPerf.default	421	427	0.99:1
LoaderMinimalPerf.default	766	776	0.99:1
RadioGroupMinimalPerf.default	612	620	0.99:1
TextMinimalPerf.default	367	369	0.99:1
AvatarMinimalPerf.default	509	520	0.98:1
ImageMinimalPerf.default	391	401	0.98:1
LayoutMinimalPerf.default	584	598	0.98:1
MenuMinimalPerf.default	1849	1888	0.98:1
MenuButtonMinimalPerf.default	1587	1617	0.98:1
SliderMinimalPerf.default	1348	1376	0.98:1
CustomToolbarPrototype.default	3566	3635	0.98:1
TooltipMinimalPerf.default	739	753	0.98:1
Button.Fluent	550	561	0.98:1
Dropdown.Fluent	3092	3157	0.98:1
Avatar.Fluent	967	999	0.97:1
Text.Fluent	354	364	0.97:1
Dialog.Fluent	1748	1813	0.96:1
AccordionMinimalPerf.default	192	203	0.95:1
BoxMinimalPerf.default	316	332	0.95:1
CheckboxMinimalPerf.default	2770	2909	0.95:1
DropdownMinimalPerf.default	3077	3228	0.95:1
PortalMinimalPerf.default	309	331	0.93:1
ProviderMinimalPerf.default	605	656	0.92:1
TextAreaMinimalPerf.default	506	552	0.92:1
AlertMinimalPerf.default	281	321	0.88:1
Image.Fluent	365	426	0.86:1

[mnajdova]

Add changelog entry before merging