Dynamic grql api wrapper on application sync (#15791)

# Introduction

Important note: for the moment testing this locally will require some
hack due to latest twenty-sdk not being published.
You will need to build twenty-cli and `cd packages/twenty-cli && yarn
link`
To finally sync the app in your app folder as `cd app-folder && twenty
app sync`

close https://github.com/twentyhq/core-team-issues/issues/1863

In this PR is introduced the generate sdk programmatic call to
[genql](https://genql.dev/) exposed in a `client` barrel of `twenty-sdk`
located in this package as there's high chances that will add a codegen
layer above it at some point ?

The cli calls this method after a sync application and writes a client
in a generated folder. It will make a graql introspection query on the
whole workspace. We should later improve that and only filter by current
applicationId and its dependencies ( when twenty-standard application is
introduced )

Fully typesafe ( input, output, filters etc ) auto-completed client

## Hello-world app serverless refactor

<img width="2480" height="1326" alt="image"
src="https://github.com/user-attachments/assets/b18ea372-b21d-4560-8fbc-1dc348427a95"
/>

---------

Co-authored-by: martmull <martmull@hotmail.fr>

packages/twenty-cli/src/services/api.service.ts

@@ -6,6 +6,11 @@ import {
   type PackageJson,
 } from '../types/config.types';
 import { ConfigService } from './config.service';
+import {
+  buildClientSchema,
+  getIntrospectionQuery,
+  printSchema,
+} from 'graphql/index';
 
 export class ApiService {
   private client: AxiosInstance;
@@ -188,4 +193,48 @@ export class ApiService {
       throw error;
     }
   }
+
+  async getSchema(): Promise<ApiResponse<string>> {
+    try {
+      const introspectionQuery = getIntrospectionQuery();
+
+      const response = await this.client.post(
+        '/graphql',
+        {
+          query: introspectionQuery,
+        },
+        {
+          headers: {
+            'Content-Type': 'application/json',
+            Accept: '*/*',
+          },
+        },
+      );
+
+      if (response.data.errors) {
+        return {
+          success: false,
+          error: `GraphQL introspection errors: ${JSON.stringify(response.data.errors)}`,
+        };
+      }
+
+      const schema = buildClientSchema(response.data.data);
+
+      return {
+        success: true,
+        data: printSchema(schema),
+        message: 'Successfully load schema',
+      };
+    } catch (error) {
+      if (axios.isAxiosError(error) && error.response) {
+        return {
+          success: false,
+          error:
+            error.response.data.errors[0]?.message ||
+            'Failed to load graphql Schema',
+        };
+      }
+      throw error;
+    }
+  }
 }