feat: Add compact variant to GSB

[micahjones13]

Brief Description

This PR adds a new compact prop to GSB. This renders the GSB in a shorter, more slim version as per the community design here.

Adds compact story as well.

General Notes

Motivation and Context

Update our component to match new designs.

Issues and Limitations

Types of changes

• Bug fix
• New feature
• Breaking change

Checklist

• This PR adds or removes a Storybook story.
• I have added tests to cover my changes.
• Regressions are passing and/or failures are documented
• Changes have been checked in evergreen browsers

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🦋 Changeset detected

Latest commit: 6c72e30

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

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