Move view in metadata-modules/ and create atomic folder + module for each view entity (#14990)

# Introduction
Preparing view-filter and view-group introduction in v2 core engine
Moving view from `core-modules` to `metadata-modules`

## What happened

### Created dedicated modules for each view entity:
- ViewFieldModule
- ViewFilterModule
- ViewFilterGroupModule
- ViewGroupModule
- ViewSortModule

### Each module is now completely independent with its own:
- Controller
- Resolver
- Service
- Entity

### Created dedicated abstraction metadata module folder for:
- flat-view-field
- flat-view

### Dependencies 
- Eleminated circular dep on ViewModule to all others ones
- Granular import not importing the whole viewModule anymore everywhere


close https://github.com/twentyhq/core-team-issues/issues/1703

packages/twenty-server/src/engine/metadata-modules/flat-view/constants/flat-view-editable-properties.constant.ts

@@ -0,0 +1,15 @@
+import { type FlatView } from 'src/engine/metadata-modules/flat-view/types/flat-view.type';
+
+export const FLAT_VIEW_EDITABLE_PROPERTIES = [
+  'name',
+  'type',
+  'icon',
+  'position',
+  'isCompact',
+  'openRecordIn',
+  'kanbanAggregateOperation',
+  'kanbanAggregateOperationFieldMetadataId',
+  'anyFieldFilterValue',
+  'calendarLayout',
+  'calendarFieldMetadataId',
+] as const satisfies (keyof FlatView)[];

packages/twenty-server/src/engine/metadata-modules/flat-view/constants/flat-view-properties-to-compare.constant.ts

@@ -0,0 +1,8 @@
+import { FLAT_VIEW_EDITABLE_PROPERTIES } from 'src/engine/metadata-modules/flat-view/constants/flat-view-editable-properties.constant';
+import { type FlatView } from 'src/engine/metadata-modules/flat-view/types/flat-view.type';
+
+export const FLAT_VIEW_PROPERTIES_TO_COMPARE = [
+  'key',
+  'deletedAt',
+  ...FLAT_VIEW_EDITABLE_PROPERTIES,
+] as const satisfies (keyof FlatView)[];

packages/twenty-server/src/engine/metadata-modules/flat-view/constants/view-entity-relation-properties.constant.ts

@@ -0,0 +1,11 @@
+import { type ViewEntityRelationProperties } from 'src/engine/metadata-modules/flat-view/types/flat-view.type';
+
+export const VIEW_ENTITY_RELATION_PROPERTIES = [
+  'objectMetadata',
+  'viewFields',
+  'viewFilters',
+  'viewFilterGroups',
+  'viewGroups',
+  'viewSorts',
+  'workspace',
+] as const satisfies ViewEntityRelationProperties[];