reorganize into pkgext

[codecov[bot]]

Codecov Report

Merging #19 (607ca40) into main (e1f7ca2) will decrease coverage by 14.25%. The diff coverage is 91.07%.

@@             Coverage Diff             @@
##             main      #19       +/-   ##
===========================================
- Coverage   74.41%   60.17%   -14.25%     
===========================================
  Files           3       14       +11     
  Lines          43      452      +409     
===========================================
+ Hits           32      272      +240     
- Misses         11      180      +169     

Impacted Files	Coverage Δ
ext/QuantumCliffordExt/QuantumCliffordExt.jl	54.28% <ø> (ø)
src/QSymbolicsBase/basic_ops_inhomogeneous.jl	25.00% <0.00%> (ø)
src/QSymbolicsBase/express.jl	66.66% <ø> (ø)
src/QSymbolicsBase/latexify.jl	9.37% <ø> (ø)
src/QSymbolicsBase/predefined.jl	39.06% <ø> (ø)
src/QSymbolicsBase/predefined_CPTP.jl	7.69% <ø> (ø)
src/QSymbolicsBase/rules.jl	68.42% <ø> (ø)
src/QuantumSymbolics.jl	100.00% <ø> (ø)
ext/QuantumOpticsExt/should_upstream.jl	91.11% <71.42%> (ø)
...t/MixedCliffordOpticsExt/MixedCliffordOpticsExt.jl	100.00% <100.00%> (ø)
... and 4 more

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