Add "default closed groups" prop

[cdriesler]

Adds an optional defaultClosedGroups string array prop to the root <Control /> element. When set, any groups named in the array will show as closed on first draw.

Example

const a = useControl('First Setting', { type: 'boolean'})
const b = useControl('Second Setting', { type: 'boolean', group: 'GroupA' })
const c = useControl('Third Setting', { type: 'boolean', group: 'GroupB' })

return <Control defaultClosedGroups={['GroupB']} />

Settings list GroupB would then be collapsed on first draw.

Note

Using this library a lot lately (thank you!) and could really use the option for some of my longer control lists. Understood if this is not ideal because it's a rogue prop on the top-level component. Betting that this is preferred to polluting the useControl hook, but happy to do a version with it there instead if I was wrong.

[birkir]

Sorry for the late merge. Thank you!