## Context
ObjectMetadataService became quite large and handles too many
responsibilities. I'm trying to refactor a bit this part in preparation
of a larger work that will combine object-metadata services and
sync-metadata logic
- Created a STANDARD_OBJECT_ICONS that can be reused in relation
creation to refer to a standard object icon.
- Created a STANDARD_OBJECT_FIELD_IDS that can be used with an object
name to get its standard field ids.
- Moved migration, record and relation creations to dedicated services,
refactored to improve performances and readability
- Refactored some validation logic
---------
Co-authored-by: Charles Bochet <charles@twenty.com>
This PR introduce a new decorator named `@WorkspaceJoinColumn`, the goal
of this one is to manually declare the join columns inside the workspace
entities, so we don't have to rely on `ObjectRecord` type.
This decorator can be used that way:
```typescript
@WorkspaceRelation({
standardId: ACTIVITY_TARGET_STANDARD_FIELD_IDS.company,
type: RelationMetadataType.MANY_TO_ONE,
label: 'Company',
description: 'ActivityTarget company',
icon: 'IconBuildingSkyscraper',
inverseSideTarget: () => CompanyWorkspaceEntity,
inverseSideFieldKey: 'activityTargets',
})
@WorkspaceIsNullable()
company: Relation<CompanyWorkspaceEntity> | null;
// The argument is the name of the relation above
@WorkspaceJoinColumn('company')
companyId: string | null;
```
