feat: allow customizing sizes

[unekinn]

DO NOT MERGE - test-custom-sizes.d.ts just exists to prove it works

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This PR shows an approach we could use if we wanted to allow consumers to define their own sizing scale

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Latest commit: fa2f901

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[github-actions]

Preview deployments for this pull request:

Storybook - 3. Mar 2025 - 14:19

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	47.95%	3210 / 6694
🔵	Statements	47.95%	3210 / 6694
🔵	Functions	84.61%	220 / 260
🔵	Branches	77.44%	563 / 727

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/react/src/sizes.ts	0%	0%	0%	0%
packages/react/src/types.ts	0%	0%	0%	0%
packages/react/src/components/Avatar/Avatar.tsx	75%	100%	50%	75%	89-99
packages/react/src/components/Combobox/useFormField/useFormField.ts	100%	71.42%	100%	100%
packages/react/src/components/Heading/Heading.tsx	100%	50%	100%	100%
packages/react/src/components/Paragraph/Paragraph.tsx	100%	100%	100%	100%
packages/react/src/components/Spinner/Spinner.tsx	100%	100%	100%	100%

Generated in workflow #2360 for commit fa2f901 by the Vitest Coverage Report Action