uefi: use core::net types in public API, remove net type duplicates
          #1645
        
          
      
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This PR started as a "big PR" to address the vision in #1575. In the meantime, multiple smaller PRs have been spitted out and merged before. This is the final PR to close the ticket.
TL;DR:
uefiuefi-raw's net typesCloses #1575.
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