Refactor donut metric summary

[marshallpete]

Description

Refactor the donut API so that DonutSummary is its own component. In a future PR, I will break out ArcLabel into its own component.

Related Issue

#218
#180

Motivation and Context

This cleans up the API and also makes the summary optional

Stories

Donut > DonutSummary

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[marshallpete]

This is a breaking change but it is on an alpha component so we are safe.

I'll update the docs when I finish up the productionization of donut.

[github-actions]

🎨 Storybook -> https://opensource.adobe.com/react-spectrum-charts/PR-344

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
1 Accepted issue

Measures
0 Security Hotspots
95.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

🎨 Storybook -> https://opensource.adobe.com/react-spectrum-charts/PR-344