add contrast ratio, lightOrDark fn

[drwpow]

Changes

Adds 2 new functions:

• colorContrast(): get contrast ratio for 2 colors
• lightOrDark(): help determine whether to use white or black text over a color

Checklist

• [x] Changeset added (pnpm run changeset)
• [x] Clear description of changes in PR notes and changeset
• [x] I’ve added a test where I can

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 286d114e9c19dcf0fe7f62329c171c2092bc27be

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

This PR includes changesets to release 1 package

| Name | Type | | ------------------ | ----- | | better-color-tools | Minor |

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