add cosmos seds to demo nb #161

[sschmidt23]

Update the BPZ demo notebook so that it includes a run with additional SEDs (see #166 in rail_base, which will need to be merged first before this updated notebook will successfully run). I added comparisons of CWWSB to the COSMOS SEDs and show that scatter is reduced at the expense of 3-4x the runtime.

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b14fc48) to head (73518eb).
Report is 4 commits behind head on main.

Additional details and impacted files

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##              main      #162   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines            1         1           
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  Hits             1         1           

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[hangqianjun]

Looks good!