Draft: Add `forward_size` and `backward_size` type-level functions

José Miguel Sánchez Garcíarequested to merge
omixann/spade:type-level-size into main

Author checklist

  • New Diagnostics have at least one snapshot test that triggers it
  • Added a changelog entry, if relevant
    • You can use ./add_changelog <MR number or a_descriptive_name> to do this

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