Preserve condition object in a miraiError

[shikokuchuo]

Appends the original condition as an attribute to the character string returned.
Allows access to custom metadata specified in a call to rlang::abort().

Closes #173.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (7b589c5) to head (f641da0).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files           9        9           
  Lines         864      864           
=======================================
  Hits          845      845           
  Misses         19       19           

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