Experiment.start Returns Records

[MattToast]

Basic implementation of a Record class to keep track of launched jobs. Convert Experiment.start return Records and all other methods to accept records.

[codecov]

Codecov Report

Attention: Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.

Project coverage is 47.46%. Comparing base (cce16e6) to head (e06bbac).
Report is 19 commits behind head on smartsim-refactor.

Files with missing lines	Patch %	Lines
smartsim/launchable/job.py	86.66%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           smartsim-refactor     #744      +/-   ##
=====================================================
+ Coverage              40.45%   47.46%   +7.00%     
=====================================================
  Files                    110      109       -1     
  Lines                   7326     6590     -736     
=====================================================
+ Hits                    2964     3128     +164     
+ Misses                  4362     3462     -900     

Files with missing lines	Coverage Δ
smartsim/_core/utils/helpers.py	41.43% <ø> (+1.25%)	⬆️
smartsim/experiment.py	88.53% <100.00%> (+6.98%)	⬆️
smartsim/launchable/job.py	93.84% <86.66%> (+3.36%)	⬆️

... and 12 files with indirect coverage changes

[amandarichardsonn]

Some small suggestions!

[amandarichardsonn]

Why do you deep copying the Job but not the launch_id here?

[MattToast]

In theory, the launch_id (at least for now), is just a string that we ask the type checker to treat like a different type, and strings are immutable in python, so a "deepcopy of" and a "reference to" a string are functionally equivalent.

There is actually some special logic in copy.deepcopy so that, by default, it will just return the original reference to a string if its encounter without change.

TL;DR I was lazy and didn't want to spell out "deepcopy". More than willing to add it though if we think that LaunchedJobID might become a more substantive type in future!