add_agf changes and tests

[alfredclwong]

Changes

• Increase robustness of add_agf by adding more checks to the name argument.
• Add a testset for sources.jl

Note: the TODOs are left as low priority items for later. Currently focusing on the UI work.

[codecov-commenter]

Codecov Report

Merging #177 (fad4e08) into main (69b8b74) will increase coverage by 0.78%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   56.01%   56.79%   +0.78%     
==========================================
  Files          66       66              
  Lines        6352     6358       +6     
==========================================
+ Hits         3558     3611      +53     
+ Misses       2794     2747      -47     

Impacted Files	Coverage Δ
src/GlassCat/sources.jl	89.09% <87.09%> (+89.09%)	⬆️
src/GlassCat/generate.jl	88.65% <100.00%> (ø)
src/Optical/LensAssembly.jl	56.17% <0.00%> (+0.61%)	⬆️
src/Optical/OpticalSystem.jl	35.89% <0.00%> (+0.64%)	⬆️
src/Optical/Fresnel.jl	97.40% <0.00%> (+1.29%)	⬆️

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