Refactor code organization after adding Aerosols and Emissions

[boulderdaze]

This PR:

• Types are now organized into species, reactions, aerosol, emissions. The species file also includes phases, since species is its primary type.
• Moves Print function in the public header used exclusively by google test to test/utils. This avoids including <ostream> and gtest helpers in non-test builds, where they are never used.
• Moves Version struct out of mechanism. The push macro/pop macro glibc workaround is noisy. mechansim.hpp now contains mechanism struct only , and no platform specific workarounds.
• Capitalizes all constants for consistency (boltzmann -> BOLTZMANN)
• Splits emissions_parser.hpp, which bundles CheckEmissionsSchema and ParseEmissionsSection into seperate schema.hpp and parser.hpp files.
• Renames ParseEmissionsSection to ParseEmissions for consistency. (@smeechncar, let me know what you think about the renaming.)
• Moves ParseEmissionsSection() into Build() so species, phases, reactions, aerosol, and emissions are all assembled in one place.
• Separates emissions validation logics from gas model validation by creating ValidateEmissionsModel.
• Files in the top level directory contain code shared across multiple structs. For example, Arrhenius keys remains at the top level because it is used by both the reactions and aerosols.
• Renames GetReactionComponentName -> GetComponentName because it's also used to extract species names and phase-species names, not just reaction reactants/productss
• Closes Improve Emissions handling consistency #291

Note: This PR is large, but it contains no actual code changes unless explicitly noted in the comments. The changes are limited to code reorganization, file relocations, and renaming.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.08063% with 136 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.68%. Comparing base (b6a7001) to head (c6b4fac).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/v1/aerosol/schema.cpp	78.23%	37 Missing ⚠️
src/v1/aerosol/parsers.cpp	85.00%	27 Missing ⚠️
src/v1/reactions/schema.cpp	72.09%	12 Missing ⚠️
src/v1/reactions/surface.cpp	72.09%	12 Missing ⚠️
src/v1/species/parsers.cpp	83.92%	9 Missing ⚠️
src/v1/emissions/parsers.cpp	88.23%	8 Missing ⚠️
src/v1/aerosol/utils.cpp	80.95%	4 Missing ⚠️
src/v1/reactions/branched.cpp	89.47%	4 Missing ⚠️
src/v1/reactions/arrhenius.cpp	93.02%	3 Missing ⚠️
src/v1/reactions/parsers.cpp	89.65%	3 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
+ Coverage   87.57%   87.68%   +0.10%     
==========================================
  Files          41       45       +4     
  Lines        2479     2484       +5     
==========================================
+ Hits         2171     2178       +7     
+ Misses        308      306       -2     

Files with missing lines	Coverage Δ
include/mechanism_configuration/errors.hpp	100.00% <ø> (+42.85%)	⬆️
...lude/mechanism_configuration/mechanism_version.hpp	100.00% <100.00%> (ø)
src/detail/v1/reactions/parsers.hpp	100.00% <ø> (ø)
src/schema.cpp	87.93% <ø> (ø)
src/v0/arrhenius_parser.cpp	100.00% <100.00%> (ø)
src/v0/branched_parser.cpp	100.00% <100.00%> (ø)
src/v0/emission_parser.cpp	100.00% <ø> (ø)
src/v0/first_order_loss_parser.cpp	100.00% <ø> (ø)
src/v0/parser.cpp	87.61% <ø> (ø)
src/v0/photolysis_parser.cpp	100.00% <ø> (ø)
... and 30 more

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[smeechncar]

@boulderdaze I have no problem with the name change since it is purely internal to MC and invisible to MUSICA.

[K20shores]

This makes my soul feel good