Add expanded ellipses options

[teddybradford]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

Re: #9 discussion, this PR adds 'unspaced' and 'spaced' options to ellipses config:

• when true, turns triple dots into ellipses (with or without spaces between);
• when 'unspaced', turns triple dots into ellipses (only for those without spaces);
• when 'spaced', turns triple dots into ellipses (only for those with spaces).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc33ba5) 100.00% compared to head (9d98f00) 100.00%.

❗ Current head 9d98f00 differs from pull request most recent head 79d7f19. Consider uploading reports for the commit 79d7f19 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #11   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          354       377   +23     
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+ Hits           354       377   +23     

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[wooorm]

Thanks for your patience and thanks for your work!

This looks quite good!

I am not sure about the style names, and how the options are described. To me this reads as if the resulting ellipses are (un)spaced. I’m not sure what names I’d prefer, so here some suggestions on description.

Can you also put the new docs in the API section of the readme? Thanks!

[teddybradford]

@wooorm Thank you for reviewing! I think I've added in all the changes you asked for. Let me know how it looks.

[wooorm]

thanks, released! https://github.com/retextjs/retext-smartypants/releases/tag/6.1.0