Add QuantumOpticsSystem for creating QuantumSystem

[maxwell04-wq]

Fixes #85.

• Added a function QuantumOpticsSystem for creating a system using QuantumOptics
• Extended a new QuantumSystem function for compatibility with QuantumOpticsSystem
• Added tests for QuantumOpticsSystem

[maxwell04-wq]

@aarontrowbridge I have tried to run the tests but it seems to stop after reaching maximum iterations. There were some conflicts initially, which I have resolved before pushing the commits.

[maxwell04-wq]

@aarontrowbridge I believe that the PR is ready to review now. I have not added the docs yet; I need some time to document it.

[aarontrowbridge]

let's see if the CI runs

[maxwell04-wq]

@aarontrowbridge can you confirm whether I need to create the QuantumSystem object using QuantumOpticsBase.Operator as mentioned in the PR or using QuantumObject{SparseMatrixCSC, ...} object as discussed in the call? I have implemented them both, but the latter is commented out.
Also, can you please review it before day end so that I can make any major changes before the end of UnitaryHack if necessary?

[aarontrowbridge]

this looks good thanks!

[maxwell04-wq]

Awesome! This was fun; thanks for all the help:)