Implemented comment thread target picker with new dropdown components (#295)

* First draft of new relation picker and usage in comments
---------

Co-authored-by: Charles Bochet <charles@twenty.com>

front/src/modules/ui/components/form/Checkbox.tsx

@@ -2,8 +2,8 @@ import * as React from 'react';
 import styled from '@emotion/styled';
 
 type OwnProps = {
-  name: string;
-  id: string;
+  name?: string;
+  id?: string;
   checked?: boolean;
   indeterminate?: boolean;
   onChange?: (newCheckedValue: boolean) => void;