Refactor object metadata service (#8123)
## Context ObjectMetadataService became quite large and handles too many responsibilities. I'm trying to refactor a bit this part in preparation of a larger work that will combine object-metadata services and sync-metadata logic - Created a STANDARD_OBJECT_ICONS that can be reused in relation creation to refer to a standard object icon. - Created a STANDARD_OBJECT_FIELD_IDS that can be used with an object name to get its standard field ids. - Moved migration, record and relation creations to dedicated services, refactored to improve performances and readability - Refactored some validation logic --------- Co-authored-by: Charles Bochet <charles@twenty.com>
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