[#159] Create button component

[ludovic35]

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

Related issues

#159

Description

Implementation of button

Motivation & Context

Types of change

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

Previews

Checklist

Contribution

• I have read the contributing guidelines

Accessibility

• My change follows accessibility good practices

Design

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

Development

• My change follows the developer guide
• I checked my changes do not add new SwiftLint warnings
• I have added unit tests to cover my changes (optional)

Documentation

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

Checklist (for Core Team only)

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

[pylapp]

Je me suis permis pour gagner du temps et nous permettre d'avancer plus vite, de corriger quelques fautes de frappe et d'améliorer la documentation après avoir fait un rebase de la branche avant la relecture du code.

C'est bon pour moi, néanmoins il manque les tests UI sur les boutons.
Tant que ces tests ne seront pas implémentés on ne pourra merger pull request.

J'ai également pris en charge l'option d'a11y servant à désactiver les animations concernant l'état loading du bouton.