Add new symbolic bosonic operators and states

[apkille]

I will add express functionalities for QuantumOptics and Gabs in separate PRs to make review easier. This review paper is a good quick reference for the quantum objects implemented here.

One thing to note: I would like to add symbolic position and momentum operators in the future. With the way the internals of QSymbolics are currently defined, this would require having support for PositionBasis and MomentumBasis types in QOBase.jl (https://github.com/qojulia/QuantumOpticsBase.jl/blob/c9c24f96ed9b79a2cb2eeeeb6fc497defedea6a5/src/particle.jl#L6-L63). I suppose we could migrate ParticleBasis subtypes into QuantumInterface.jl so that they could be used here? Would that be easy to do? Linking this issue qojulia/QuantumInterface.jl#33.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 75.96%. Comparing base (a4980ef) to head (16dff93).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/QSymbolicsBase/predefined_fock.jl	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   76.62%   75.96%   -0.67%     
==========================================
  Files          19       19              
  Lines         830      828       -2     
==========================================
- Hits          636      629       -7     
- Misses        194      199       +5     

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[Krastanov]

Thanks! A few comments below:

• I noticed two separate pre-existing problems with the predefined_fock stuff. No need to fix them here, but could you make an issue for each to track them?
• Some questions about how things are printed, how things are named, and a few type constraints.

[Krastanov]

migrating ParticleBasis makes sense to me

[apkille]

@Krastanov let me know when this looks good to merge.

[apkille]

@Krastanov ping.

[Krastanov]

Sorry for the lateness on reviewing this. If the changes I made in the last commit make sense and are fine with you, and if the tests pass, feel free to merge.

[apkille]

LGTM. Failing tests are unrelated to this PR.