recover panic to promise

[ichiban]

An alternative solution for #288

While #288 makes an interpreter transparent to panics, this PR makes it eagerly convert panics to Prolog exceptions.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (207281f) 99.11% compared to head (afba508) 99.11%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   99.11%   99.11%           
=======================================
  Files          23       23           
  Lines        7201     7211   +10     
=======================================
+ Hits         7137     7147   +10     
  Misses         59       59           
  Partials        5        5           

Impacted Files	Coverage Δ
engine/builtin.go	99.52% <100.00%> (+<0.01%)	⬆️
engine/promise.go	100.00% <100.00%> (ø)
engine/vm.go	94.46% <100.00%> (+0.04%)	⬆️

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[guregu]

Good idea IMO. I used a similar approach in trealla-js.