Export use confirm hook and confirmation dialog

[VanAnderson]

Export ConfirmationDialog and useConfirm from index.

https://github.slack.com/archives/C01L618AEP9/p1619730448377100

[changeset-bot]

🦋 Changeset detected

Latest commit: 64d3d69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/components	Patch

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[smockle]

Running yarn run dist locally gave me these warnings, which may be related to why CI is failing:

[dist:rollup] (!) Circular dependencies
[dist:rollup] src/index.ts -> src/Dialog/ConfirmationDialog.tsx -> src/index.ts
[dist:rollup] src/index.ts -> src/Dialog/ConfirmationDialog.tsx -> src/Dialog/Dialog.tsx -> src/index.ts
[dist:rollup] src/index.ts -> src/ActionList/index.ts -> src/ActionList/List.tsx -> src/ActionList/Item.tsx -> src/index.ts

Update: Fixed in be4febc, basically by replacing imports from .. (index.ts, barrel) with imports from explicit individual module paths.