[newchem-cpp] Adding dust model with related parameters

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Summary

• Adds a new dust_model parameter to chemistry_data (default: 0) to select between dust models
  • dust_model = 0: default behavior (runs calc_grain_size_increment_1d as usual)
  • dust_model = 1: Harrison dust model — skips calc_grain_size_increment_1d and uses custom dust growth/destruction routines
• Implements dust growth (accretion) and dust destruction (SNe shocks + thermal sputtering) in dust_growth_and_destruction.hpp and dust_growth_and_destruction.cpp
• Adds associated parameters: dust_destruction_eff, sne_coeff, sne_shockspeed, dust_grainsize, dust_growth_densref, dust_growth_tauref, use_sne_field

Key changes

• src/include/grackle_chemistry_data.h / grackle_chemistry_data_fields.def: new dust_model parameter and dust physics parameters
• src/clib/dust_growth_and_destruction.cpp/.hpp: dust growth and destruction implementation
• src/clib/calc_tdust_3d.cpp, cool1d_multi_g.cpp, dust/lookup_dust_rates1d.hpp: guard calc_grain_size_increment_1d calls with dust_model == 0

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Note on solver_method default: The golden standard test answers were generated with solver_method=1, so changing the default causes shape and value mismatches in CI (e.g., freefall-primordial_rate_variants-1-0 produced 5725 vs 5739 timesteps).