New Timeline (#4936)

Refactored the code to introduce two different concepts:
- AuditLogs (immutable, raw data)
- TimelineActivities (user-friendly, transformed data)

Still some work needed:
- Add message, files, calendar events to timeline (~2 hours if done
naively)
- Refactor repository to try to abstract concept when we can (tbd, wait
for Twenty ORM)
- Introduce ability to display child timelines on parent timeline with
filtering (~2 days)
- Improve UI: add links to open note/task, improve diff display, etc
(half a day)
- Decide the path forward for Task vs Notes: either introduce a new
field type "Record Type" and start going into that direction ; or split
in two objects?
- Trigger updates when a field is changed (will be solved by real-time /
websockets: 2 weeks)
- Integrate behavioral events (1 day for POC, 1 week for
clean/documented)

<img width="1248" alt="Screenshot 2024-04-12 at 09 24 49"
src="https://github.com/twentyhq/twenty/assets/6399865/9428db1a-ab2b-492c-8b0b-d4d9a36e81fa">

packages/twenty-front/src/modules/activities/timeline/hooks/useLinkedObject.ts

@@ -0,0 +1,16 @@
+import { useRecoilValue } from 'recoil';
+
+import { objectMetadataItemsState } from '@/object-metadata/states/objectMetadataItemsState';
+import { ObjectMetadataItem } from '@/object-metadata/types/ObjectMetadataItem';
+
+export const useLinkedObject = (id: string) => {
+  const objectMetadataItems: ObjectMetadataItem[] = useRecoilValue(
+    objectMetadataItemsState,
+  );
+
+  return (
+    objectMetadataItems.find(
+      (objectMetadataItem) => objectMetadataItem.id === id,
+    ) ?? null
+  );
+};