feat(graphql): add timestamps to files and champs

[tchak]

No description provided.

[what-the-diff]

PR Summary

• Introduction of an 'updatedAt' Field to Various GraphQL Types
  This update adds a new component, dubbed 'updatedAt', into numerous GraphQL types. This field, designed to hold dates and times in the ISO8601 format, aids in tracking the most recent modification times for several aspects such as address, cart, checkbox, etc.

• Addition of an 'updatedAt' Field to the 'ChampType' GraphQL Type
  This change introduces a new 'updatedAt' field into the 'ChampType' GraphQL type, similarly intended to record the latest modification moment in the ISO8601 date-time format.

• Inclusion of a 'created_at' Field to the 'File' GraphQL Type
  A new element, 'created_at', has been included to the 'File' GraphQL type. This field, which also uses the ISO8601 date-time format, is to log when a file first enters the system.

• Changes in the 'dossier_type.rb' File
  The dossier_type.rb file has been altered to include the 'created_at' field for both 'pdf' and 'geojson' methods. This gives rise to a system-recognized timestamp for when a file was created, resulting in better organization and tracking of filed data.

[mfo]

pas l'habitude des api graphql mais je suis surpris/déçu qu'il faille ajouter le updatedAt sur tous les type.
Ex: AddressChampDescriptor implements ChampDescriptor, j'aurais imaginé que le delcarer sur ChampDescriptor propagerait le truc.