Expose all error constructors

[ccamel]

This PR tackles issue #310.

I propose to make all error types public, similar to how domain_error and others were previously made accessible. Given our project's significant reliance on ichiban/prolog, having access to the entire spectrum of error types used by the library would be highly beneficial for us as developers.

This means making these error constructors available for everyone: existence_error, permission_error, representation_error, resource_error, syntax_error, and evaluation_error.

Thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c682cd3) 99.21% compared to head (11c4f43) 99.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #313   +/-   ##
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  Coverage   99.21%   99.21%           
=======================================
  Files          23       23           
  Lines        7272     7283   +11     
=======================================
+ Hits         7215     7226   +11     
  Misses         51       51           
  Partials        6        6           

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[ichiban]

Thank you for the high quality PR! I have a couple of minor change proposals.

[ccamel]

@ichiban Thanks for the code review and your insightful comments. Much appreciated. I've made the updates.