move field_name from Extra to state
          #1858
        
          
      
                
     Merged
            
            
          
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Change Summary
This PR follows up from #1857 and moves
field_nameinto theStatestruct.The goal is that the state can contain everything that's changing, which will also eventually cover include / exclude.
This PR ends up being a bit hefty because it adds lifetimes onto a ton of serializer methods. I think when we make further progress it might be possible to remove those again. The lifetimes are now in a much better place, in particular on the
Extrastruct.Related issue number
N/A
Checklist
pydantic-core(except for expected changes)