Exported getCommandBarStyles

[GeoffCoxMSFT]

To better support removing deep imports in ODSP.

Changes

• added top-level export of CommandBar getStyles as getCommandBarStyles
• added top-level export getCommandButtonStyles

Issues

Fixes #24453

[msft-fluent-ui-bot]

It looks like this change to the 7.0 branch may not have been submitted to master yet. Now that version 8 has released, all changes must be submitted to the master branch first (except in emergencies or if the change is irrelevant to version 8).

Please do one of the following:

• If you've already created a PR to master, add a link to it
• If the change is irrelevant to version 8, add a comment explaining why
• Otherwise, create a PR to master with this same change, and add a link to it

After that, you can dismiss this review and remove the "needs cherry-pick" label (or ask a team member to help do so).

Want to avoid this in the future? Include text like "Cherry-pick of ####" in the PR description (where #### is the real master PR number).

v7 specific changes

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 988305c:

Sandbox	Source
Fluent UI Button	Configuration
codesandbox-react-template	Configuration

[size-auditor]

Asset size changes

Project	Bundle	Baseline Size	New Size	Difference
office-ui-fabric-react	office-ui-fabric-react-CommandBar	199 kB	199.093 kB	93 bytes

 Over Tolerance (1024 B)  Over Baseline  Below Baseline  New   Removed 1 kB = 1000 B

Baseline commit: 0bc3300f373be2f596cab45bb319cc4afb09c082 (build)

[fabricteam]

Perf Analysis

No significant results to display.

All results

Scenario	Render type	7.0 Ticks	PR Ticks	Iterations	Status
BaseButton	mount	765	764	5000
Breadcrumb	mount	34442	34344	5000
Checkbox	mount	1276	1290	5000
CheckboxBase	mount	1067	1073	5000
ChoiceGroup	mount	4019	4034	5000
ComboBox	mount	705	718	1000
CommandBar	mount	6463	6525	1000
ContextualMenu	mount	11009	10807	1000
DefaultButton	mount	933	929	5000
DetailsRow	mount	2985	2981	5000
DetailsRowFast	mount	3031	2991	5000
DetailsRowNoStyles	mount	2835	2813	5000
Dialog	mount	1767	1753	1000
DocumentCardTitle	mount	1537	1570	1000
Dropdown	mount	2028	2035	5000
FocusTrapZone	mount	1422	1396	5000
FocusZone	mount	1512	1505	5000
IconButton	mount	1362	1378	5000
Label	mount	319	312	5000
Layer	mount	1627	1632	5000
Link	mount	404	408	5000
MenuButton	mount	1175	1176	5000
MessageBar	mount	1750	1775	5000
Nav	mount	2575	2609	1000
OverflowSet	mount	1181	1209	5000
Panel	mount	1178	1167	1000
Persona	mount	796	803	1000
Pivot	mount	1116	1104	1000
PrimaryButton	mount	1052	1057	5000
Rating	mount	6777	6676	5000
SearchBox	mount	1068	1056	5000
Shimmer	mount	2260	2284	5000
Slider	mount	1289	1284	5000
SpinButton	mount	3958	3921	5000
Spinner	mount	387	388	5000
SplitButton	mount	2474	2465	5000
Stack	mount	463	460	5000
StackWithIntrinsicChildren	mount	1381	1389	5000
StackWithTextChildren	mount	4260	4283	5000
SwatchColorPicker	mount	8076	8205	5000
TagPicker	mount	2116	2133	5000
TeachingBubble	mount	41273	41437	5000
Text	mount	399	390	5000
TextField	mount	1133	1151	5000
Toggle	mount	736	747	5000
button	mount	83	84	5000