Moving SwatchColorPicker and ButtonGrid to @fluentui/react package

[czearing]

Pull request checklist

• Include a change request file using $ yarn change

Description of changes

1. Moving ButtonGrid from @fluentui/react-internal to @fluentui/react.
2. Moving SwatchColorPicker from @fluentui/react-internal to @fluentui/react.
3. Fixing a bug in the ComponentConformance.test.tsx
4. Adding version imports to @fluentui/react component top level files.

[msft-github-bot]

Thanks for submitting this change, but due to work currently in progress to prepare master for our version 8 beta release, we're asking contributors to either wait a couple weeks to submit changes (if it's not urgent) or submit to the new 7.0 branch (if it's urgent). See #15222 for more details. Thank you for your contribution and understanding!

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Sandbox	Source
Fluent UI Button	Configuration
microsoft/fluentui: codesandbox-react-template	Configuration
microsoft/fluentui: codesandbox-react-next-template	Configuration
microsoft/fluentui: codesandbox-react-northstar-template	Configuration