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Structured GHCi Errors (#23338)

Jade requested to merge wip/structured-ghci-errors into master

This MR aims to make the error reporting and printing structured. This includes adding error codes and a more uniform way to print/display the errors. Both of these reuse/adjust existing infrastructure in the GHC codebase to avoid duplications.

TODO:

  • Rebase and resolve merge conflicts
  • Adjust tests
  • Remove / Edit TODOs in code
  • Add Constructors for remaining throwGhc/hPutStrLn stderr

Fixes #23338

Edited by Jade

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