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

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

packages/twenty-server/src/engine/metadata-modules/remote-server/dtos/update-remote-server.input.ts

@@ -10,7 +10,7 @@ import {
 import {
   UserMappingOptions,
   UserMappingOptionsUpdateInput,
-} from 'src/engine/metadata-modules/remote-server/utils/user-mapping-options.utils';
+} from 'src/engine/metadata-modules/remote-server/types/user-mapping-options';
 
 @InputType()
 export class UpdateRemoteServerInput<T extends RemoteServerType> {