Add state and builder infrastructure for DAE constraints

[dwfncar]

Prepares the solver infrastructure to support algebraic constraints:

State changes:

• Add number_of_constraints_ to StateParameters
• Add constraint_size_ and upper_left_identity_diagonal_ to State
• Size jacobian for species + constraints

SolverBuilder changes:

• Add SetConstraintCount() and SetConstraintNames() methods
• Update Build() to include constraint variables in state

This is backward compatible - when constraint_count_=0 (default), behavior is unchanged from before.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.86207% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.20%. Comparing base (aff7fe8) to head (4654f26).
⚠️ Report is 10 commits behind head on dae-1-constraint-classes.

Files with missing lines	Patch %	Lines
include/micm/solver/solver_builder.inl	33.33%	6 Missing ⚠️
include/micm/solver/state.inl	90.90%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           dae-1-constraint-classes     #906      +/-   ##
============================================================
- Coverage                     94.37%   94.20%   -0.18%     
============================================================
  Files                            69       70       +1     
  Lines                          3380     3432      +52     
============================================================
+ Hits                           3190     3233      +43     
- Misses                          190      199       +9     

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