feat: add new component wcs-mat-symbol

Raphaël Giagnoriorequested to merge
feat/wcs-mat-symbol into develop

#180

To check

  • Wait the merge of !620
  • Explain what has changed in the changelog
  • For newly created web components only : Declare all new angular proxy components in the file angular/projects/wcs-angular/src/lib/wcs-angular.module.ts
  • For newly created web components only : Add the component name in Components-Overview.mdx with its corresponding image into assets/images/components-overview
  • For newly created web components only : Add the component name in the left or right list in accessibility.mdx
Edited by Mathis Poncet

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