Replace nlohmann::json with nlohmann::ordered_json to maintain order in input/output. Bumps nanobind_json submodule. Closes #213

[Griger5]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.69%. Comparing base (da95a8d) to head (56a469d).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/json_resource.hpp	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #461   +/-   ##
=======================================
  Coverage   90.69%   90.69%           
=======================================
  Files          55       55           
  Lines        2537     2537           
  Branches      144      144           
=======================================
  Hits         2301     2301           
  Misses        163      163           
  Partials       73       73           

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