ButtonIcon: Add small size

[michaeltaranto]

Introduce a new small size for ButtonIcon component. This size sits alongside the existing standard and large sizes.

EXAMPLE USAGE:

<ButtonIcon
  size="small"
  icon={<IconEdit />}
  label="Small size"
/>

Subsequently adopting the small sized ButtonIcon for field actions such as clear field, or toggle password visibility.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1e49ec3

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

This PR includes changesets to release 1 package

Name	Type
braid-design-system	Minor

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