emit event when click on 'new element' in forms

src/App.vue

src/components/BiosourceForm.vue

src/components/EnzymaticComplexForm.vue

src/components/GeneForm.vue

src/components/GeneProductForm.vue

src/components/MetaboliteForm.vue

src/components/MthElementForm.vue

src/components/PathwayForm.vue

src/components/ReactionForm.vue

src/components/__tests__/BiosourceForm.spec.ts

src/components/__tests__/EnzymaticComplexForm.spec.ts

src/components/__tests__/GeneForm.spec.ts

src/components/__tests__/GeneProductForm.spec.ts

src/components/__tests__/MetaboliteForm.spec.ts

src/components/__tests__/PathwayForm.spec.ts

src/components/__tests__/ReactionForm.spec.ts