Fixed data for the dsl

[richfitz]

As discussed with @edknock, this allows fixed data to be inserted into the DSL code.

This can be reviewed directly, or look at #79 first and then rebase to get a smaller diff. However, the fallout is not so bad either way

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.39%. Comparing base (af75c00) to head (0be858f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   99.39%   99.39%           
=======================================
  Files          64       64           
  Lines        4756     4789   +33     
=======================================
+ Hits         4727     4760   +33     
  Misses         29       29           

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[edknock]

This is nice, I think very useful as I imagine people might have pre-analysis tasks that generate hyperparameters, and this seems like a great way to pass them into the dsl.

[weshinsley]

All makes sense!