refactor: Convert SemilinearODEFunction to use SciMLFunctionOptions

[AayushSabharwal]

Applies the ModelingToolkitBase.SciMLFunctionOptions pattern to SemilinearODEFunction, the one *Function constructor that lives in the top-level ModelingToolkit package rather than ModelingToolkitBase. Its kwargs... wrapper now assembles a SciMLFunctionOptions and delegates to a new public SemilinearODEFunction{iip,specialize}(sys, opts::SciMLFunctionOptions; kwargs...) method that does the real work without splatting arbitrary keywords, matching every other constructor in the family.

Like the rest of the family, the struct-accepting method branches directly on the struct's own expression type parameter (if E) instead of a separate expression = Val{E} local, and builds its ObservedFunctionCache by forwarding the nested GeneratedFunctionOptions directly rather than re-listing its fields as separate keywords.

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[github-actions]

Benchmark Results (Julia vlts)

Time benchmarks

	master	4b1ff45...	master / 4b1ff45...
ODEProblem	7.75 ± 1 ms	6.04 ± 0.42 ms	1.28 ± 0.19
init	0.11 ± 0.027 ms	0.0975 ± 0.031 ms	1.13 ± 0.46
large_parameter_init/ODEProblem	0.0332 ± 0.0047 s	27.1 ± 3.9 ms	1.23 ± 0.25
large_parameter_init/init	0.116 ± 0.029 ms	0.102 ± 0.041 ms	1.14 ± 0.54
mtkcompile	13.8 ± 2.6 ms	11.2 ± 0.73 ms	1.23 ± 0.25
sparse_analytical_jacobian/ODEProblem	0.0346 ± 0.0038 s	28.9 ± 1.7 ms	1.2 ± 0.15
sparse_analytical_jacobian/f_iip	1.89 ± 0.56 μs	1.89 ± 0.84 μs	1 ± 0.53
sparse_analytical_jacobian/f_oop	0.377 ± 0.03 ms	0.36 ± 0.0062 ms	1.05 ± 0.085
time_to_load	7.18 ± 0.29 s	6.2 ± 0.18 s	1.16 ± 0.058

Memory benchmarks

	master	4b1ff45...	master / 4b1ff45...
ODEProblem	0.0386 M allocs: 2.09 MB	0.0386 M allocs: 2.09 MB	1
init	0.428 k allocs: 0.0723 MB	0.428 k allocs: 0.0723 MB	1
large_parameter_init/ODEProblem	0.325 M allocs: 11.4 MB	0.325 M allocs: 11.4 MB	1
large_parameter_init/init	0.616 k allocs: 0.175 MB	0.616 k allocs: 0.175 MB	1
mtkcompile	0.0618 M allocs: 3.45 MB	0.0618 M allocs: 3.43 MB	1
sparse_analytical_jacobian/ODEProblem	0.193 M allocs: 7.93 MB	0.193 M allocs: 7.93 MB	0.999
sparse_analytical_jacobian/f_iip	0 allocs: 0 B	0 allocs: 0 B
sparse_analytical_jacobian/f_oop	0.634 k allocs: 19.6 kB	0.634 k allocs: 19.6 kB	1
time_to_load	0.153 k allocs: 14.6 kB	0.153 k allocs: 14.6 kB	1

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	4b1ff45...	master / 4b1ff45...
ODEProblem	3.9 ± 0.42 ms	3.81 ± 0.25 ms	1.03 ± 0.13
init	0.052 ± 0.0067 ms	0.0535 ± 0.0067 ms	0.972 ± 0.17
large_parameter_init/ODEProblem	22.2 ± 4.8 ms	20.5 ± 5.6 ms	1.09 ± 0.38
large_parameter_init/init	0.058 ± 0.036 ms	0.0559 ± 0.037 ms	1.04 ± 0.95
mtkcompile	6.53 ± 0.68 ms	6.17 ± 0.62 ms	1.06 ± 0.15
sparse_analytical_jacobian/ODEProblem	19.6 ± 3.4 ms	17.9 ± 3 ms	1.1 ± 0.26
sparse_analytical_jacobian/f_iip	0.06 ± 0.01 μs	0.07 ± 0.001 μs	0.857 ± 0.14
sparse_analytical_jacobian/f_oop	0.0913 ± 0.012 ms	0.0914 ± 0.012 ms	0.999 ± 0.18
time_to_load	4.95 ± 0.19 s	4.66 ± 0.033 s	1.06 ± 0.041

Memory benchmarks

	master	4b1ff45...	master / 4b1ff45...
ODEProblem	0.0375 M allocs: 1.7 MB	0.0375 M allocs: 1.7 MB	1
init	0.426 k allocs: 0.0545 MB	0.426 k allocs: 0.0545 MB	1
large_parameter_init/ODEProblem	0.352 M allocs: 12.8 MB	0.352 M allocs: 12.8 MB	1
large_parameter_init/init	0.809 k allocs: 0.154 MB	0.809 k allocs: 0.154 MB	1
mtkcompile	0.0598 M allocs: 2.75 MB	0.0598 M allocs: 2.75 MB	1
sparse_analytical_jacobian/ODEProblem	0.186 M allocs: 6.89 MB	0.186 M allocs: 6.89 MB	1
sparse_analytical_jacobian/f_iip	0 allocs: 0 B	0 allocs: 0 B
sparse_analytical_jacobian/f_oop	0.848 k allocs: 27 kB	0.848 k allocs: 27 kB	1
time_to_load	0.146 k allocs: 11.4 kB	0.146 k allocs: 11.4 kB	1