Qiskit / qiskit-fermions / 30524780342

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perf: support lazy, index-based group lookup in split_out_groups (#232)

qDRIFT and similar samplers only ever need a small subset of a
Hamiltonian's groups on any given draw, but split_out_groups()
previously had no way to ask for less than the full set, forcing
callers to materialize every group operator up front even when most
of them would never be used. Threading an optional group_indices
selector through split_out_groups() (core, pyext, and cext, across all
four operator types) lets qdrift.py fetch only the groups a sample
actually draws, in the order needed, closing one follow-up from #229.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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