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-server/src/modules/opportunity/standard-objects/opportunity.object-metadata.ts

@@ -19,7 +19,7 @@ import { BaseObjectMetadata } from 'src/engine/workspace-manager/workspace-sync-
 import { CompanyObjectMetadata } from 'src/modules/company/standard-objects/company.object-metadata';
 import { FavoriteObjectMetadata } from 'src/modules/favorite/standard-objects/favorite.object-metadata';
 import { PersonObjectMetadata } from 'src/modules/person/standard-objects/person.object-metadata';
-import { EventObjectMetadata } from 'src/modules/event/standard-objects/event.object-metadata';
+import { TimelineActivityObjectMetadata } from 'src/modules/timeline/standard-objects/timeline-activity.object-metadata';
 import { IsNotAuditLogged } from 'src/engine/workspace-manager/workspace-sync-metadata/decorators/is-not-audit-logged.decorator';
 
 @ObjectMetadata({
@@ -173,17 +173,17 @@ export class OpportunityObjectMetadata extends BaseObjectMetadata {
   attachments: Relation<AttachmentObjectMetadata[]>;
 
   @FieldMetadata({
-    standardId: opportunityStandardFieldIds.events,
+    standardId: opportunityStandardFieldIds.timelineActivities,
     type: FieldMetadataType.RELATION,
-    label: 'Events',
-    description: 'Events linked to the opportunity.',
+    label: 'Timeline Activities',
+    description: 'Timeline Activities linked to the opportunity.',
     icon: 'IconTimelineEvent',
   })
   @RelationMetadata({
     type: RelationMetadataType.ONE_TO_MANY,
-    inverseSideTarget: () => EventObjectMetadata,
+    inverseSideTarget: () => TimelineActivityObjectMetadata,
     onDelete: RelationOnDeleteAction.SET_NULL,
   })
   @IsNullable()
-  events: Relation<EventObjectMetadata[]>;
+  timelineActivities: Relation<TimelineActivityObjectMetadata[]>;
 }