LG-4658: Compact Button

[kraenhansen]

✍️ Proposed changes

Adds a compact prop to the Button component, which removes unwanted whitespace around the content of the button when displaying a glyph. See the Jira ticket for more context.

🎟 Jira ticket: LG-4658

✅ Checklist

For bug fixes, new features & breaking changes

• I have added tests that prove my fix is effective or that my feature works:
  • Storybook arg combinations.
  • A TypeScript type failure assertion in packages/button/src/Button/Button.spec.tsx.
• I have added necessary documentation (if appropriate)
• I have run yarn changeset and documented my changes

For new components

• I have added my new package to the global tsconfig
• I have added my new package to the Table of Contents on the global README
• I have verified the Live Example looks as intended on the design website.

🧪 How to test changes

Go to either of the "Large Size", "Default Size", "Small Size" or "X Small Size" pages under "Button" and scroll to the bottom to see examples of the new compact variants.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7a8b60c

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

This PR includes changesets to release 7 packages

Name	Type
@leafygreen-ui/confirmation-modal	Patch
@lg-chat/message-feedback	Patch
@leafygreen-ui/number-input	Patch
@leafygreen-ui/split-button	Patch
@leafygreen-ui/form-footer	Patch
@leafygreen-ui/code	Patch
@leafygreen-ui/button	Minor

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