Refactor backend folder structure (#4505)

* Refactor backend folder structure

Co-authored-by: Charles Bochet <charles@twenty.com>

* fix tests

* fix

* move yoga hooks

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/api/graphql/services/scalars-explorer.service.ts

@@ -0,0 +1,53 @@
+import { Injectable } from '@nestjs/common';
+
+import { GraphQLScalarType, GraphQLSchema, isScalarType } from 'graphql';
+
+import { scalars } from 'src/engine/api/graphql/workspace-schema-builder/graphql-types/scalars';
+
+@Injectable()
+export class ScalarsExplorerService {
+  private scalarImplementations: Record<string, GraphQLScalarType>;
+
+  constructor() {
+    this.scalarImplementations = scalars.reduce((acc, scalar) => {
+      acc[scalar.name] = scalar;
+
+      return acc;
+    }, {});
+  }
+
+  getScalarImplementation(scalarName: string): GraphQLScalarType | undefined {
+    return this.scalarImplementations[scalarName];
+  }
+
+  getUsedScalarNames(schema: GraphQLSchema): string[] {
+    const typeMap = schema.getTypeMap();
+    const usedScalarNames: string[] = [];
+
+    for (const typeName in typeMap) {
+      const type = typeMap[typeName];
+
+      if (isScalarType(type) && !typeName.startsWith('__')) {
+        usedScalarNames.push(type.name);
+      }
+    }
+
+    return usedScalarNames;
+  }
+
+  getScalarResolvers(
+    usedScalarNames: string[],
+  ): Record<string, GraphQLScalarType> {
+    const scalarResolvers: Record<string, GraphQLScalarType> = {};
+
+    for (const scalarName of usedScalarNames) {
+      const scalarImplementation = this.getScalarImplementation(scalarName);
+
+      if (scalarImplementation) {
+        scalarResolvers[scalarName] = scalarImplementation;
+      }
+    }
+
+    return scalarResolvers;
+  }
+}