chore: add evalite package license metadata

[itosa-kazu]

Summary:

• Add MIT license metadata to the published evalite package manifest.

Validation:

• node package metadata assertion
• npm pack --dry-run --json --ignore-scripts in packages/evalite
• git diff --check

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8d41c54

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[vercel]

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