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/workspace-migration/workspace-migration.entity.ts

@@ -67,10 +67,20 @@ export type WorkspaceMigrationForeignColumnDefinition =
     distantColumnName: string;
   };
 
+type ReferencedObject = {
+  object: string;
+};
+
+type ReferencedTableWithSchema = {
+  table_name: string;
+  schema_name: string;
+};
+
+export type ReferencedTable = ReferencedObject | ReferencedTableWithSchema;
+
 export type WorkspaceMigrationForeignTable = {
   columns: WorkspaceMigrationForeignColumnDefinition[];
-  referencedTableName: string;
-  referencedTableSchema: string;
+  referencedTable: ReferencedObject | ReferencedTableWithSchema;
   foreignDataWrapperId: string;
 };