feat: Guppy hugr -> PHIR lowering

[ss2165]

No description provided.

[codecov]

Codecov Report

Merging #215 (05e64cd) into main (4220038) will decrease coverage by 0.96%.
The diff coverage is 65.97%.

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   74.98%   74.03%   -0.96%     
==========================================
  Files          30       32       +2     
  Lines        4018     4498     +480     
  Branches     4018     4498     +480     
==========================================
+ Hits         3013     3330     +317     
- Misses        825      958     +133     
- Partials      180      210      +30     

Files	Coverage Δ
tket2/src/extension.rs	90.24% <ø> (ø)
tket2/src/utils.rs	92.59% <86.66%> (+4.35%)	⬆️
tket2/src/phir/model.rs	76.33% <76.33%> (ø)
tket2/src/phir/convert.rs	61.06% <61.06%> (ø)

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