Build stripe integration on backend side (#5246)

Adding stripe integration by making the server logic independent of the
input fields:
- query factories (remote server, foreign data wrapper, foreign table)
to loop on fields and values without hardcoding the names of the fields
- adding stripe input and type
- add the logic to handle static schema. Simply creating a big object to
store into the server

Additional work:
- rename username field to user. This is the input intended for postgres
user mapping and we now need a matching by name

---------

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/dtos/remote-table.dto.ts

@@ -1,7 +1,7 @@
 import { ObjectType, Field, registerEnumType } from '@nestjs/graphql';
 
 import { IDField } from '@ptc-org/nestjs-query-graphql';
-import { IsEnum } from 'class-validator';
+import { IsEnum, IsOptional } from 'class-validator';
 
 import { UUIDScalarType } from 'src/engine/api/graphql/workspace-schema-builder/graphql-types/scalars';
 
@@ -27,6 +27,7 @@ export class RemoteTableDTO {
   @Field(() => RemoteTableStatus)
   status: RemoteTableStatus;
 
-  @Field(() => String)
+  @IsOptional()
+  @Field(() => String, { nullable: true })
   schema?: string;
 }