compatibility with SciMLOperators

[Krastanov]

See https://docs.sciml.ai/SciMLOperators/stable/

It is a parallel development from the SciML organization that has similarities to our Lazy operators and to the waveguide operators from the WaveguideQED.jl extension to QuantumOpticsBase.jl. It would be valuable to understand and document the tradeoffs between our approaches and aim for some level of compatibility.

[Krastanov]

Somewhat related to:

• https://github.com/qojulia/QuantumOptics.jl/issues/299
• https://github.com/qojulia/QuantumOptics.jl/issues/298
• https://github.com/qojulia/QuantumOpticsBase.jl/pull/16

[Krastanov]

Also related to #172