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/modules/view/standard-view.module.ts

@@ -0,0 +1,30 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { FeatureFlagModule } from 'src/engine/core-modules/feature-flag/feature-flag.module';
+import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
+import { ViewFieldEntity } from 'src/engine/metadata-modules/view-field/entities/view-field.entity';
+import { ViewFilterGroupEntity } from 'src/engine/metadata-modules/view-filter-group/entities/view-filter-group.entity';
+import { ViewFilterEntity } from 'src/engine/metadata-modules/view-filter/entities/view-filter.entity';
+import { ViewGroupEntity } from 'src/engine/metadata-modules/view-group/entities/view-group.entity';
+import { ViewSortEntity } from 'src/engine/metadata-modules/view-sort/entities/view-sort.entity';
+import { ViewEntity } from 'src/engine/metadata-modules/view/entities/view.entity';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([
+      ViewEntity,
+      ViewFieldEntity,
+      ViewFilterEntity,
+      ViewFilterGroupEntity,
+      ViewGroupEntity,
+      ViewSortEntity,
+    ]),
+    TypeOrmModule.forFeature([ObjectMetadataEntity]),
+    FeatureFlagModule,
+  ],
+
+  providers: [],
+  exports: [],
+})
+export class StandardViewModule {}