feat(hugr-sexpr): Add s-expression library.

[zrho]

This PR adds the hugr-sexpr library for s-expressions.

• Read s-expressions from a string.
• Pretty print s-expressions.
• Derive macros for converting between s-expressions and user defined types.

(This commit also updates the devenv lock file to the newest version, since on the main branch version the Rust toolchain fails to work on my machine.)

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 119 lines in your changes missing coverage. Please review.

Project coverage is 86.98%. Comparing base (bcc1e2d) to head (2a898f1).
Report is 1 commits behind head on main.

Files	Patch %	Lines
hugr-sexpr-derive/src/input.rs	91.07%	16 Missing and 3 partials ⚠️
hugr-sexpr/src/lib.rs	80.41%	19 Missing ⚠️
hugr-sexpr/src/output.rs	73.97%	18 Missing and 1 partial ⚠️
hugr-sexpr/src/input.rs	74.24%	15 Missing and 2 partials ⚠️
hugr-sexpr-derive/src/output.rs	84.69%	12 Missing and 3 partials ⚠️
hugr-sexpr/src/read.rs	86.27%	11 Missing and 3 partials ⚠️
hugr-sexpr-derive/src/common.rs	76.92%	4 Missing and 5 partials ⚠️
hugr-sexpr/src/escape.rs	87.71%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1208      +/-   ##
==========================================
- Coverage   87.03%   86.98%   -0.06%     
==========================================
  Files         100      110      +10     
  Lines       18918    19751     +833     
  Branches    16935    17768     +833     
==========================================
+ Hits        16466    17180     +714     
- Misses       1676     1775      +99     
- Partials      776      796      +20     

Flag	Coverage Δ
rust	86.48% <85.71%> (-0.04%)	⬇️

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[aborgna-q]

Some comments to ensure the new crates work well with the automation.

[zrho]

As a general purpose s-expression crate this probably does not belong in this repository after all.