Improve mirai_map() interface

[shikokuchuo]

Allow use of ... to pass in constant variables in exactly the same manner as base::lapply() and purrr::map().

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.72%. Comparing base (2d2f6d7) to head (b918f21).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #181   +/-   ##
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  Coverage   98.72%   98.72%           
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  Files           9        9           
  Lines         863      863           
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  Hits          852      852           
  Misses         11       11           

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[shikokuchuo]

As the tidyverse recommendation is now to use anonymous functions instead of the '...' to pass in constant arguments, there is not a great incentive to provide the exact same interface.

The existing interface is consistent with mirai() with ... being global variables.