Defining literal quantum objects with macros

[apkille]

Enables users to quickly define symbolic bras, kets, and operators with macros. If a basis for the quantum object is not specified, then by default the spin-1/2 basis will be selected.

julia> @sket k
|k⟩

julia> @sbra b
⟨b|

julia> @sop A
A

julia> b*k
⟨b||k⟩

julia> A*k
A|k⟩

julia> QuantumSymbolics.basis(k)
Spin(1/2)

julia> @sbra b FockBasis(2)
⟨b|

julia> QuantumSymbolics.basis(b)
Fock(cutoff=2)

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.37%. Comparing base (6847efb) to head (6a1f908).

Files	Patch %	Lines
src/QSymbolicsBase/literal_objects.jl	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   62.71%   63.37%   +0.65%     
==========================================
  Files          15       15              
  Lines         582      587       +5     
==========================================
+ Hits          365      372       +7     
+ Misses        217      215       -2     

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[Krastanov]

after the JET tests pass feel free to merge. A couple of guidelines:

• unless you have a specific reason, always use "Squash and merge", not rebase or merge commit options from the github interface
• before merge, please make an extra commit to update the CHANGELOG.
• if you plan to immediately make a new version release update the Project.toml to 0.3.1 and use today's date in the CHANGELOG header for 0.3.1
• if you plan to wait a bit to merge other things (personal choice, but generally not necessary to wait) update the Project.toml to 0.3.1-dev and use the string dev instead of a date in the CHANGELOG header for 0.3.1
• if you want to make a public release, after this is merged go to the page for the very latest commit in this repository and leave a comment @JuliaRegistrator register

[JuliaRegistrator]

Comments on pull requests will not trigger Registrator, as it is disabled. Please try commenting on a commit or issue.

[Krastanov]

welp... I JuliaRegistrator was a bit too trigger happy :D I hoped it will not respond if I put its handle in backticks.

[Krastanov]

as mentioned on the other pull request: actually, it seems the JET tests fail on master too, because of something I must have merged last minute as I was cleaning up the tests. You can just bump the threshold to 7 and not bother with them