Adding propagators#543

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Gavin-Rockwood wants to merge 10 commits intoqutip:mainfrom

Gavin-Rockwood:AddingPropagators

Commits on Aug 4, 2025

playing with the ensemble_sesolve function to make it more efficient. Currently cannot do multiple parameters, but can do multiple initial states along with being type stable.
Gavin-Rockwood
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hmm
Gavin-Rockwood
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Commits on Sep 1, 2025

Added propagator.jl and qeye_like.jl
Gavin-Rockwood
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Commits on Sep 10, 2025