feat: Lists and extension sets with splicing

[zrho]

Closes #1609.

[codecov]

Codecov Report

Attention: Patch coverage is 73.42995% with 55 lines in your changes missing coverage. Please review.

Project coverage is 85.46%. Comparing base (e63878f) to head (9a820cb).

Files with missing lines	Patch %	Lines
hugr-core/src/import.rs	59.67%	16 Missing and 9 partials ⚠️
hugr-core/src/export.rs	78.33%	13 Missing ⚠️
hugr-model/src/v0/text/print.rs	70.96%	2 Missing and 7 partials ⚠️
hugr-model/src/v0/text/parse.rs	68.75%	2 Missing and 3 partials ⚠️
hugr-model/src/v0/binary/read.rs	85.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1657      +/-   ##
==========================================
- Coverage   85.51%   85.46%   -0.06%     
==========================================
  Files         136      136              
  Lines       25264    25285      +21     
  Branches    22176    22197      +21     
==========================================
+ Hits        21605    21610       +5     
- Misses       2455     2466      +11     
- Partials     1204     1209       +5     

Flag	Coverage Δ
python	92.42% <ø> (ø)
rust	84.49% <73.42%> (-0.06%)	⬇️

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[hugrbot]

This PR contains breaking changes to the public Rust API.
Please deprecate the old API instead (if possible), or mark the PR with a ! to indicate a breaking change.

cargo-semver-checks summary

--- failure enum_struct_variant_field_added: pub enum struct variant field added ---

Description:
An enum's exhaustive struct variant has a new field, which has to be included when constructing or matching on this variant.
      ref: https://doc.rust-lang.org/reference/attributes/type_system.html#the-non_exhaustive-attribute
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.36.0/src/lints/enum_struct_variant_field_added.ron

Failed in:
field items of variant Term::ExtSet in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-model/src/v0/mod.rs:607

--- failure enum_struct_variant_field_missing: pub enum struct variant's field removed or renamed ---

Description:
A publicly-visible enum has a struct variant whose field is no longer available under its prior name. It may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.36.0/src/lints/enum_struct_variant_field_missing.ron

Failed in:
field tail of variant Term::List, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-model/src/v0/mod.rs:578
field extensions of variant Term::ExtSet, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-model/src/v0/mod.rs:617
field rest of variant Term::ExtSet, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-model/src/v0/mod.rs:619