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;
```
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