fix: add xs and xxs sizes

[jason-capsule42]

New sizes of XS and XXS added in order to support small containers like auro-buttons new loading state.

Alaska Airlines Pull Request

Fixes: #7

Type of change:

Please delete options that are not relevant.

• [x] New capability
• [ ] Revision of an existing capability
• [ ] Infrastructure change (automation, etc.)
• [ ] Other (please elaborate)

Checklist:

• [x] My update follows the CONTRIBUTING guidelines of this project
• [x] I have performed a self-review of my own update

By submitting this Pull Request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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-- Auro Design System Team

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:tada: This PR is included in version 1.1.0 :tada:

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