feat: improve tokens validation

[lifaon74]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/Infomaniak/design-system/blob/main/CONTRIBUTING.md#submit-a-pull-request
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Problem

Tokens must be validated to follow our rules.

It must:

1. Tokens

• check if the token json files follow the DTCG format (validation against zod schema)
• check if t2 and t3 contains only references (=> no values)

2. Modifiers

• check if the modifiers contains only existing tokens (present in t2 and t3)
• check if modifiers contains only references (=> no values)
• check that contexts of a single modifier contain the same list of tokens
• check if many modifiers do not modify the same token

Solution

Implement better validation

[github-actions]

⏭️ Storybook build skipped

• Reason: pull request is still in draft
• Changed files inspected: 58
• Workflow run: View details

Storybook build was intentionally skipped for this PR event.

Relevant files

• packages/assets/images/svg/package.json
• packages/tokens/scripts/scripts/build-tokens/src/build/build-tokens.ts
• packages/tokens/scripts/scripts/build-tokens/src/constants/design-token-tiers.ts
• packages/tokens/scripts/scripts/validate-tokens/validate-tokens.script.ts
• packages/tokens/scripts/shared/dtcg/design-token/reference/value-or/expect/expect-design-token-reference.ts
• ...and 53 more

[vjo]

LGTM