Small big step confluence test

[7h3kk1d]

Adds a qcheck test that says if the small steps from the stepper evaluate to a value that should be equivalent to the evaluator. Always chooses the first available step.

It's currently real slow and doesn't find issues every time. I'm also not calling EvaluatorStep.refresh_step which might be important.

Example failure:

FAIL Small step reduction and big step reduction are equal

   Expected: `fun x: (?) -> fun (()): (()) -> x'
   Received: `fun x: (?) -> fun (()): (()) -> x''

`
on `fun x -> fun (()) -> x (after 2 shrink steps)`

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.35%. Comparing base (a8bb437) to head (39a1a38).

Additional details and impacted files

@@                Coverage Diff                 @@
##           cat-resiliency    #1633      +/-   ##
==================================================
+ Coverage           50.32%   50.35%   +0.03%     
==================================================
  Files                 126      130       +4     
  Lines               14048    14621     +573     
==================================================
+ Hits                 7070     7363     +293     
- Misses               6978     7258     +280     

Files with missing lines	Coverage Δ
src/haz3lcore/dynamics/Evaluator.re	92.98% <ø> (-3.32%)	⬇️
src/haz3lcore/dynamics/stepper/EvaluatorStep.re	60.43% <ø> (ø)

... and 23 files with indirect coverage changes

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