feat: colored avatar (#554)

* feat: colored avatar

* fix: use id instead of name & remove unused

* fix: remove unused

* Allow empty ID to avoid empty string

* Fix tests

* Add person chip story

---------

Co-authored-by: Emilien <emilien.chauvet.enpc@gmail.com>

front/src/modules/utils/string-to-hsl.ts

@@ -0,0 +1,13 @@
+export function stringToHslColor(
+  str: string,
+  saturation: number,
+  lightness: number,
+) {
+  let hash = 0;
+  for (let i = 0; i < str.length; i++) {
+    hash = str.charCodeAt(i) + ((hash << 5) - hash);
+  }
+
+  const h = hash % 360;
+  return 'hsl(' + h + ', ' + saturation + '%, ' + lightness + '%)';
+}