feat: add xsmall and xlarge modal sizes

[sashuk]

FX-4211

Description

This pull request adds two new Modal sizes – xsmall and xlarge.

How to test

• Temploy

Screenshots

Development checks

• Add changeset according to guidelines (if needed)
• Read CONTRIBUTING.md and Component API principles
• Make sure that additions and changes on the design follow Toptal's BASE design, and it's been already discussed with designers at #-base-core
• [N/A] Annotate all props in component with documentation
• [N/A] Create examples for component
• Ensure that deployed demo has expected results and good examples
• [N/A] Ensure the changed/created components have not caused accessibility issues. How to use accessibility plugin in storybook.
• Self reviewed
• Covered with tests (visual tests included)

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GitHub Bot: TODOLess action

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• @toptal-bot run package:alpha-release - Release alpha version
• @toptal-anvil ping reviewers - Ping FX team for review

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6dddd86

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

This PR includes changesets to release 1 package

Name	Type
@toptal/picasso	Minor

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[augustobmoura]

The code looks simple enough, it looks like the problems with testing are related to Happo being down today