Add critical tracing to Python interface

CMakeLists.txt

externals/nlohmann_json/nlohmann/json.hpp

externals/pybind11_json/.github/workflows/main.yml

externals/pybind11_json/.gitignore

externals/pybind11_json/CMakeLists.txt

externals/pybind11_json/LICENSE

externals/pybind11_json/README.md

...als/pybind11_json/include/pybind11_json/pybind11_json.hpp

externals/pybind11_json/pybind11_jsonConfig.cmake.in

externals/pybind11_json/test/CMakeLists.txt

externals/pybind11_json/test/copyGTest.cmake.in

externals/pybind11_json/test/downloadGTest.cmake.in

externals/pybind11_json/test/test_pybind11_json.cpp

include/teqp/algorithms/critical_tracing.hpp

include/teqp/models/multifluid.hpp

interface/pybind11_wrapper.cpp

notebooks/trace_critical.py