Apply schema mapping to resources

[imsdu]

Motivation
Following #4703, about introducing a new entity to define and manage a schema mapping by type, the next step is to apply it to resources during creation

Acceptance criteria

1. When the schema is not provided by the user, Delta will inject a schema to validate the resource with from this configuration and resource validation will follow the same workflow as if it was provided by the user
2. If no mapping are found for a type, Delta will attempt to make it unconstrained (and return an error if this is not allowed on the enclosing project)

Not in scope

1. Updating the schema for resources when the schema mapping configuration is updated.