Add Yearwheel grammar and tests for Langium#7459

Shahir-47 wants to merge 3 commits intomermaid-js:developmermaid-js/mermaid:developfrom

Shahir-47:feature/7421_add-sunburst-diagramShahir-47/mermaid:feature/7421_add-sunburst-diagramCopy head branch name to clipboard