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-front/src/modules/settings/integrations/database-connection/utils/editDatabaseConnection.ts

@@ -28,7 +28,7 @@ export const getFormDefaultValuesFromConnection = ({
         dbname: connection.foreignDataWrapperOptions.dbname,
         host: connection.foreignDataWrapperOptions.host,
         port: connection.foreignDataWrapperOptions.port,
-        username: connection.userMappingOptions?.username || undefined,
+        user: connection.userMappingOptions?.user || undefined,
         schema: connection.schema || undefined,
         password: '',
       };
@@ -51,7 +51,7 @@ export const formatValuesForUpdate = ({
       const formattedValues = {
         userMappingOptions: pickBy(
           {
-            username: formValues.username,
+            user: formValues.user,
             password: formValues.password,
           },
           identity,