Add SciMLOperators-backed lazy operators and benchmarks

[CleanDev-Fix]

This adds a SciMLOperators-backed lazy-operator extension to QuantumOpticsBase, wires the package and test environments to load SciMLOperators, and adds focused tests plus a local benchmark script.

Verified locally:

• extension loads in the package environment
• smoke check shows 0.0 dense difference for a sample operator
• test/test_sciml_lazyoperators.jl passes 11/11
• benchmark script runs and reports comparative timings for the new path

Benchmark takeaway:

• the current lazy implementation is faster in the tested sizes
• SciML caching helps, but remains slower than the current implementation

Known gap:

• full package-wide CI was not rerun in this attempt