feat!: Use the hugr builder

[aborgna-q]

This is an in-progress transplant of guppy from using an ad-hoc Hugr definition into the builder from the hugr library.

The main mismatch between the old and new builders is that guppy used to lazily add typed ports to the graph nodes as it needed. Since the new builder requires operations to define their signature, we end up having to edit the code everywhere from guppylang.compiler to the guppylang.prelude definitions.

My first goal is to get this working, and then I will try and split some changes from this PR (although most of it will have to be merged monolithically).

Current test status:

• 390 $\color{green}\text{passed}$
• 14 $\color{yellow}\text{skipped}$
• 0 $\color{red}\text{failed}$

These issues currently breake some tests. I'll fix them before merging the PR

• Add metadata support to hugr-py hugr#1319
  Required to store the module names in the hugr metadata
• Mismatched serialisation of Consts between rust and python hugr#1424
  Required for pytket and llvm integration
• Release hugr and tket2 with the latest changes

Closes #257. Closes #85

BREAKING CHANGE: Removed guppylang.hugr_builder.hugr.Hugr, compiling a module returns a hugr.ext.Package instead. Use module.compile_hugr to obtain a hugr.Hugr.

BEGIN_COMMIT_OVERRIDE
feat!: Use the hugr builder

BREAKING CHANGE: Removed guppylang.hugr_builder.hugr.Hugr, compiling a module returns a hugr.Package instead.
END_COMMIT_OVERRIDE

[mark-koch]

Nice work, I think this is ready to be merged! I'm happy with your builtins solution, way nicer than before.