[#32] Add raw tokens and semantic tokens for elevation

[pylapp]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

32

Description

• Review and fix draft raw and semantic tokens for elevation.
• Add unit tests for elevations raw tokens.
• Add unit tests for eelvation semantic tokens overriding.
• Add unit tests for inverse theme colors.

Definition of Done

• [x] Check and update raw tokens
• [x] Implement all raw tokens (missing elevation-box-shadow-bottom-0)
• [x] Check and update semantic tokens
• [x] Implement all semantic tokens (missing elevation-box-shadow-bottom-0)
• [x] Add unit tests for raw tokens (order relationship for example)
• [x] Add unit tests for semantic tokens (override by subtheme for example)
• [x] If colors, add unit tests for inverse theme (same colors in light and dark modes)

Motivation & Context

See #32

Types of change

• New feature (non-breaking change which adds functionality)

Previews

Checklist

Contribution

• [x] I have read the contributing guidelines

Accessibility

• (NA) My change follows accessibility good practices

Design

• (NA) My change respects the design guidelines of Orange Unified Design System

Development

• [x] My change follows the developer guide
• [x] I have added unit tests to cover my changes (optional)

Documentation

• [x] My change introduces changes to the documentation and/or I have updated the documentation accordingly

Checklist (for Core Team only)

• [x] The evolution have been tested and the project builds for iPhones and iPads
• [x] Code review has been done by reviewers according to CODEOWNERS file
• (NA) Design review has been done
• (NA) Accessibiltiy review has been done
• (NA) Q/A team has tested the evolution
• [x] Documentation has been updated if relevant
• (NA) Internal files have been updated if relevant (like CONTRIBUTING, DEVELOP, THIRD_PARTY, CONTRIBUTORS, NOTICE)
• [x] CHANGELOG has been updated respecting keep a changelog rules and reference the issues

[pylapp]

Pull request is still in draft mode because some raw and semantic token is missing ("Box shadow (Composite)"). Need more details to implement them, see https://github.com/Orange-OpenSource/ouds-ios/issues/32#issuecomment-2269180064